Oklo (OKLO) 10-Q14 Nov 242024 Q3 Quarterly reportFinancial data

Company Profile

Cover

Cover - shares	9 Months Ended
Cover - shares	Sep. 30, 2024	Nov. 14, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2024
Document Transition Report	false
Entity File Number	001-40583
Registrant Name	Oklo Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	86-2292473
Entity Address, Address Line One	3190 Coronado Dr.
Entity Address, City or Town	Santa Clara
Entity Address, State or Province	CA
City Area Code	650
Local Phone Number	550-0127
Entity Address, Postal Zip Code	95054
Title of 12(b) Security	Class A common stock, par value $0.0001 per share
Trading Symbol	OKLO
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		122,096,270
Document Fiscal Year Focus	2024
Central Index Key	0001849056
Amendment Flag	false
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($)	Sep. 30, 2024	Dec. 31, 2023	[1]
Current assets:
Cash and cash equivalents	$ 91,799,754	$ 9,867,588
Marketable securities	139,590,389	0
Total prepaid and other current assets	3,436,207	4,330,465
Total current assets	234,826,350	14,198,053
Marketable securities	57,080,461	0
Property and equipment, net	679,870	577,671
Operating lease right-of-use assets	1,092,152	82,677
Other assets	115,000	25,361
Total assets	293,793,833	14,883,762
Current liabilities:
Accounts payable	361,240	2,273,823
Accrued expenses and other	4,019,173	835,541
Operating lease liabilities	466,624	93,935
Total current liabilities	4,847,037	3,203,299
Operating lease liabilities, net of current portion	670,195	0
Simple agreements for future equity	0	46,042,000
Right of first refusal liability	25,000,000	0
Total liabilities	30,517,232	49,245,299
Commitments and contingencies (Note 14)
Stockholders' equity (deficit):
Class A common stock, $0.0001 par value – 500,000,000 shares authorized; 122,096,270 and 69,242,940 shares issued and outstanding as of September 30, 2024 and December 31, 2023, respectively	12,210	6,924
Additional paid-in capital	385,363,981	27,124,983
Accumulated deficit	(124,820,677)	(61,493,444)
Accumulated other comprehensive income	2,721,087	0
Total stockholders’ equity (deficit)	263,276,601	(34,361,537)
Total liabilities and stockholders’ equity	$ 293,793,833	$ 14,883,762

[1] (1) Derived from audited financial statements.

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2024	May 09, 2024	May 08, 2024	Dec. 31, 2023	Nov. 05, 2018
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.0001			$ 0.0001
Common stock, authorized (in shares)	500,000,000	501,000,000		500,000,000
Common stock, issued (in shares)	122,096,270			69,242,940	39,923,611
Common stock, outstanding (in shares)	122,096,270	122,096,270	1,386,983	69,242,940

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($)	3 Months Ended		9 Months Ended
Condensed Consolidated Statements of Operations - USD ($)	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Operating expenses
Research and development	$ 5,049,070	$ 1,707,457	$ 19,428,854	$ 5,457,176
General and administrative	7,232,018	2,956,338	17,993,599	5,895,883
Total operating expenses	12,281,088	4,663,795	37,422,453	11,353,059
Loss from operations	(12,281,088)	(4,663,795)	(37,422,453)	(11,353,059)
Other income (loss)
Change in fair value of simple agreements for future equity	0	(4,083,000)	(29,919,959)	(6,578,000)
Interest and dividend income	2,546,886	78,839	4,403,763	79,301
Total other income (loss)	2,546,886	(4,004,161)	(25,516,196)	(6,498,699)
Loss before income taxes	(9,734,202)	(8,667,956)	(62,938,649)	(17,851,758)
Income taxes	(224,963)	0	(388,584)	0
Net loss	(9,959,165)	(8,667,956)	(63,327,233)	(17,851,758)
Deemed dividend - earnout and founder shares	0	0	(487,934,600)	0
Net loss attributable to common stockholders	$ (9,959,165)	$ (8,667,956)	$ (551,261,833)	$ (17,851,758)
Net loss per share:
Basic (in dollars per share)	$ (0.08)	$ (0.13)	$ (0.65)	$ (0.32)
Diluted (in dollars per share)	(0.08)	(0.13)	(0.65)	(0.32)
Net loss per share attributable to common stockholders:
Basic (in dollars per share)	(0.08)	(0.13)	(5.65)	(0.32)
Diluted (in dollars per share)	$ (0.08)	$ (0.13)	$ (5.65)	$ (0.32)
Weighted-average number of shares outstanding - basic (in shares)	122,134,375	68,450,929	97,581,987	55,502,066
Weighted-average number of shares outstanding - diluted (in shares)	122,134,375	68,450,929	97,581,987	55,502,066

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Loss - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net loss	$ (9,959,165)	$ (8,667,956)	$ (63,327,233)	$ (17,851,758)
Other comprehensive income:
Change in unrealized gains on marketable debt securities	2,303,068	0	2,721,087	0
Total comprehensive loss	$ (7,656,097)	$ (8,667,956)	$ (60,606,146)	$ (17,851,758)

Condensed Consolidated Statem_3

Condensed Consolidated Statements Stockholders’ Equity (Deficit) - USD ($)	Total		Previously Reported	Revision of Prior Period, Adjustment	Common Class A	Common Stock		Common Stock Previously Reported	[1]	Common Stock Revision of Prior Period, Adjustment	[1]	Common Stock Common Class A	Common Stock Common Class A Previously Reported	Common Stock Common Class A Revision of Prior Period, Adjustment	Additional Paid-in Capital	Additional Paid-in Capital Previously Reported	Additional Paid-in Capital Revision of Prior Period, Adjustment	Accumulated Deficit	Accumulated Deficit Previously Reported	Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income Previously Reported
Balance as of beginning of period (in shares) at Dec. 31, 2022	0		6,585,881	(6,585,881)
Balance as of beginning of period at Dec. 31, 2022	$ 0		$ 25,030,520	$ (25,030,520)
Balance as of end of period (in shares) at Jun. 30, 2023	0
Balance as of end of period at Jun. 30, 2023	$ 0
Common stock, outstanding balance as of beginning of the period (in shares) at Dec. 31, 2022						0	[1]	4,771,025		(4,771,025)		68,845,564	0	68,845,564
Equity, balance as of beginning of the period at Dec. 31, 2022	(3,080,546)		$ (28,111,066)	$ 25,030,520		$ 0	[1]	$ 477		$ (477)		$ 6,885	$ 0	$ 6,885	$ 26,233,356	$ 1,209,244	$ 25,024,112	$ (29,320,787)	$ (29,320,787)	$ 0	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	96,793														96,793
Net loss	(9,183,802)																	(9,183,802)
Common stock, outstanding balance as of end of period (in shares) at Jun. 30, 2023						0	[1]					68,845,564
Equity, balance as of end of period at Jun. 30, 2023	$ (12,167,555)					$ 0	[1]					$ 6,885			26,330,149			(38,504,589)		0
Balance as of beginning of period (in shares) at Dec. 31, 2022	0		6,585,881	(6,585,881)
Balance as of beginning of period at Dec. 31, 2022	$ 0		$ 25,030,520	$ (25,030,520)
Balance as of end of period (in shares) at Sep. 30, 2023	0
Balance as of end of period at Sep. 30, 2023	$ 0
Common stock, outstanding balance as of beginning of the period (in shares) at Dec. 31, 2022						0	[1]	4,771,025		(4,771,025)		68,845,564	0	68,845,564
Equity, balance as of beginning of the period at Dec. 31, 2022	(3,080,546)		$ (28,111,066)	$ 25,030,520		$ 0	[1]	$ 477		$ (477)		$ 6,885	$ 0	$ 6,885	26,233,356	$ 1,209,244	$ 25,024,112	(29,320,787)	$ (29,320,787)	0	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)					0
Exercise of stock options					$ 0
Net loss	(17,851,758)
Common stock, outstanding balance as of end of period (in shares) at Sep. 30, 2023						0	[1]					68,979,534
Equity, balance as of end of period at Sep. 30, 2023	$ (20,749,433)					$ 0	[1]					$ 6,898			26,416,214			(47,172,545)		0
Balance as of beginning of period (in shares) at Jun. 30, 2023	0
Balance as of beginning of period at Jun. 30, 2023	$ 0
Balance as of end of period (in shares) at Sep. 30, 2023	0
Balance as of end of period at Sep. 30, 2023	$ 0
Common stock, outstanding balance as of beginning of the period (in shares) at Jun. 30, 2023						0	[1]					68,845,564
Equity, balance as of beginning of the period at Jun. 30, 2023	(12,167,555)					$ 0	[1]					$ 6,885			26,330,149			(38,504,589)		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)					133,970
Exercise of stock options	38,675				$ 38,675							$ 13			38,662
Stock-based compensation	47,403														47,403
Net loss	(8,667,956)																	(8,667,956)
Common stock, outstanding balance as of end of period (in shares) at Sep. 30, 2023						0	[1]					68,979,534
Equity, balance as of end of period at Sep. 30, 2023	$ (20,749,433)					$ 0	[1]					$ 6,898			26,416,214			(47,172,545)		0
Balance as of beginning of period (in shares) at Dec. 31, 2023	0
Balance as of beginning of period at Dec. 31, 2023	$ 0
Balance as of end of period (in shares) at Jun. 30, 2024	0
Balance as of end of period at Jun. 30, 2024	$ 0
Common stock, outstanding balance as of beginning of the period (in shares) at Dec. 31, 2023	69,242,940					0	[2]					69,242,940
Equity, balance as of beginning of the period at Dec. 31, 2023	$ (34,361,537)	[3]				$ 0	[2]					$ 6,924			27,124,983			(61,493,444)		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)												1,345,625
Exercise of stock options	439,922											$ 135			439,787
Issuance of Class A common stock in connection with the Business Combination, net of transaction costs (Note 3) (in shares)												43,099,811
Issuance of Class A common stock in connection with the Business Combination, net of transaction costs (Note 3)	260,859,623											$ 4,310			260,855,313
Issuance of Class A common stock upon conversion of simple agreements for future equity immediately before the Business Combination (Note 3) (in shares)												8,407,894
Issuance of Class A common stock upon conversion of simple agreements for future equity immediately before the Business Combination (Note 3)	86,193,959											$ 841			86,193,118
Other comprehensive income (loss)	418,019																			418,019
Stock-based compensation	9,124,416														9,124,416
Net loss	(53,368,068)																	(53,368,068)
Common stock, outstanding balance as of end of period (in shares) at Jun. 30, 2024						0	[2]					122,096,270
Equity, balance as of end of period at Jun. 30, 2024	$ 269,306,334					$ 0	[2]					$ 12,210			383,737,617			(114,861,512)		418,019
Balance as of beginning of period (in shares) at Dec. 31, 2023	0
Balance as of beginning of period at Dec. 31, 2023	$ 0
Balance as of end of period (in shares) at Sep. 30, 2024	0
Balance as of end of period at Sep. 30, 2024	$ 0
Common stock, outstanding balance as of beginning of the period (in shares) at Dec. 31, 2023	69,242,940					0	[2]					69,242,940
Equity, balance as of beginning of the period at Dec. 31, 2023	$ (34,361,537)	[3]				$ 0	[2]					$ 6,924			27,124,983			(61,493,444)		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)					1,345,625
Exercise of stock options					$ 439,922
Net loss	$ (63,327,233)
Common stock, outstanding balance as of end of period (in shares) at Sep. 30, 2024	122,096,270					0	[2]					122,096,270
Equity, balance as of end of period at Sep. 30, 2024	$ 263,276,601					$ 0	[2]					$ 12,210			385,363,981			(124,820,677)		2,721,087
Balance as of beginning of period (in shares) at Jun. 30, 2024	0
Balance as of beginning of period at Jun. 30, 2024	$ 0
Balance as of end of period (in shares) at Sep. 30, 2024	0
Balance as of end of period at Sep. 30, 2024	$ 0
Common stock, outstanding balance as of beginning of the period (in shares) at Jun. 30, 2024						0	[2]					122,096,270
Equity, balance as of beginning of the period at Jun. 30, 2024	269,306,334					$ 0	[2]					$ 12,210			383,737,617			(114,861,512)		418,019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)					0
Exercise of stock options					$ 0
Other comprehensive income (loss)	2,303,068																			2,303,068
Stock-based compensation	1,626,364														1,626,364
Net loss	$ (9,959,165)																	(9,959,165)
Common stock, outstanding balance as of end of period (in shares) at Sep. 30, 2024	122,096,270					0	[2]					122,096,270
Equity, balance as of end of period at Sep. 30, 2024	$ 263,276,601					$ 0	[2]					$ 12,210			$ 385,363,981			$ (124,820,677)		$ 2,721,087

[1] (1) The shares of the Company’s common stock prior to the Business Combination have been retrospectively recast to reflect the change in the capital structure as a result of the Business Combination as described in Note 3. (1) The shares of the Company’s common stock prior to the Business Combination (as defined below) have been retrospectively recast to reflect the change in the capital structure as a result of the Business Combination as described in Note 3. (1) Derived from audited financial statements.

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
Condensed Consolidated Statements of Cash Flows - USD ($)	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities
Net loss	$ (63,327,233)	$ (17,851,758)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	180,420	36,514
Change in fair value of simple agreements for future equity	29,919,959	6,578,000
Accretion of discount on marketable debt securities	(261,145)	0
Stock-based compensation	10,750,780	144,196
Change in operating assets and liabilities:
Prepaid and other current assets	(833,202)	81,974
Other assets	(89,639)	25,909
Accounts payable	(1,924,326)	203,972
Accrued expenses and other	630,339	423,118
Operating lease liabilities	33,409	(15,562)
Net cash used in operating activities	(24,920,638)	(10,373,637)
Cash flows from investing activities
Purchases of property and equipment	(282,619)	(60,087)
Purchases of marketable debt securities	(261,081,678)	0
Proceeds from redemptions of marketable debt securities	67,393,060	0
Net cash used in investing activities	(193,971,237)	(60,087)
Cash flows from financing activities
Proceeds from recapitalization	276,209,768	0
Proceeds from exercise of stock options	439,922	38,675
Proceeds from right of first refusal liability	25,000,000	0
Proceeds from simple agreements for future equity	10,232,000	12,315,000
Payment of deferred issuance costs	(11,057,649)	(1,563,558)
Net cash provided by financing activities	300,824,041	10,790,117
Net increase in cash and cash equivalents	81,932,166	356,393
Cash and cash equivalents - beginning of year	9,867,588	9,653,528
Cash and cash equivalents - end of period	91,799,754	10,009,921
Supplemental disclosures of cash flow information
Cash paid for interest	0	0
Cash paid for income taxes	356,890	0
Supplemental noncash investing and financing activities
Reclassification of deferred issuance costs in connection with business combination	3,604,235	0
Reclassification of simple agreements for future equity in connection with business combination	86,193,959	0
Deferred issuance costs included in accounts payable	$ 0	$ 1,463,614

Nature of Operations and Organi

Nature of Operations and Organization	9 Months Ended
Nature of Operations and Organization	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations and Organization	Nature of Operations and Organization Oklo Inc. (following the Business Combination where AltC changed its name to Oklo Inc., the “Company” or “Oklo”), conducts its operations through its subsidiary Oklo Technologies, Inc., a Delaware corporation incorporated on July 3, 2013 (formerly known as Oklo Inc. before the Business Combination and referred to herein as “Legacy Oklo”) (as further described below). The Company is developing advanced fission power plants to provide clean, reliable, and affordable energy at scale. The Company plans to commercialize its liquid metal fast reactor technology with the Aurora powerhouse product line. The first commercial Aurora powerhouse is designed to produce up to 15 and 50 megawatts of electricity (“MWe”) on both recycled nuclear fuel and fresh fuel. Oklo’s advanced fission technology has a history of successful operation, first demonstrated by the Experimental Breeder Reactor-II, which sold and supplied power to the grid and showed effective waste recycling capabilities for over 30 years of operation. Furthermore, Oklo has achieved several significant deployment and regulatory milestones, including securing a site use permit from the U.S. Department of Energy (“DOE”) for the Idaho National Laboratory (“INL”) Site and a fuel award from INL for a commercial-scale advanced fission power plant in Idaho. On May 9, 2024, the Company consummated a business combination pursuant to an Agreement and Plan of Merger and Reorganization dated July 11, 2023 (as amended, modified, supplemented or waived, the “Merger Agreement”), by and among the Company, AltC Acquisition Corp., a Delaware corporation (“AltC”) and AltC Merger Sub, Inc., a Delaware corporation and a direct, wholly owned subsidiary of AltC (“Merger Sub”). Pursuant to the terms of the Merger Agreement, Merger Sub merged with and into Oklo Inc., with Oklo Inc. surviving the merger as a wholly owned subsidiary of AltC (following the merger Oklo Inc. changed its name to Oklo Technologies, Inc.) (the “Merger” and, together with the other transactions contemplated by the Merger Agreement, the “Business Combination”) (as further described in Note 3). Upon consummation of the Business Combination (the “Closing”), AltC changed its name to Oklo Inc. The Company’s Class A common stock commenced trading on the New York Stock Exchange (“NYSE”) under the symbol “OKLO” on May 10, 2024. Liquidity and Capital Resources As of September 30, 2024, the Company’s cash, cash equivalents and marketable debt securities were $288,470,604, which includes the proceeds received from the Business Combination. The Company continues to incur significant operating losses. For the nine months ended September 30, 2024, the Company had a net loss of $63,327,233, loss from operations of $37,422,453 and net cash used in operating activities of $24,920,638. As of September 30, 2024, the Company had an accumulated deficit of $124,820,677. Management expects that significant on-going operating expenditures will be necessary to successfully implement the Company’s business plan and develop its powerhouses. The Company will utilize its existing cash, cash equivalents and marketable debt securities to fund its powerhouses, operations, and growth plans. The Company believes that as a result of the Business Combination, its existing cash, cash equivalents and marketable debt securities will be sufficient to fund its operations for the one-year period following the issuance date of the accompanying condensed consolidated financial statements as of and for the three and nine months ended September 30, 2024.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
Summary of Significant Accounting Policies	Sep. 30, 2024
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Basis of Presentation The accompanying unaudited condensed consolidated financial statements and accompanying notes are prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial reporting. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and Articles 8 and 10 of Regulation S-X of the U.S. Securities and Exchange Commission (“SEC”). Certain information or footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted, pursuant to the rules and regulations of the SEC for interim financial reporting. Accordingly, it does not include all the information and footnotes necessary for a complete presentation of financial position, results of operations, or cash flows. The information herein should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s Registration Statement on Form S-1, as amended (File No. 333-280344), which was declared effective on September 18, 2024. In the opinion of management, the accompanying unaudited condensed consolidated financial statements include all adjustments, consisting of a normal recurring nature, which are necessary for a fair statement of the financial position, operating results, and cash flows for the periods presented. Segments To date, the Company has viewed its financial information on an aggregate basis for the purposes of evaluating financial performance and allocating the Company’s resources. Accordingly, the Company has determined that it operates in one segment. Principles of Consolidation The condensed consolidated financial statements include the Company’s accounts and those of its wholly owned subsidiaries Oklo Technologies, Inc. and Oklo Power LLC. All intercompany transactions and balances have been eliminated. Use of Estimates Preparation of financial statements in conformity with U.S. GAAP requires management to make estimates, judgments, and assumptions that affect the amounts reported and disclosed in the condensed consolidated financial statements and accompanying notes. Actual results could differ materially from these estimates. On an ongoing basis, the Company evaluates its estimates, including those related to the valuation of the operating lease liabilities and operating right-of-use assets, useful lives of property and equipment, stock-based compensation expense, valuation allowance on deferred tax assets, fair value of simple agreements for future equity and valuations related to the Business Combination. These estimates, judgments, and assumptions are based on current and expected economic conditions, historical data, and experience available at the date of the accompanying condensed consolidated financial statements, and various other factors that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Risk and Uncertainties The Company is subject to continuing risks and uncertainties in connection with the current macroeconomic environment, including as a result of inflation, instability in the global banking system, geopolitical factors, including the ongoing conflicts in Ukraine and Israel. At this point, the extent to which these effects may impact the Company’s future financial condition or results of operations is uncertain, and as of the date of issuance of these financial statements, the Company is not aware of any specific event or circumstance that would require the update of any estimates or judgments or an adjustment of the carrying value of any assets or liabilities. Given the nature of the business, the ongoing conflicts in Ukraine and Israel have not had a specific impact on the Company’s financial performance. These estimates may change as new events occur and additional information is obtained and will be recognized in the financial statements as soon as they become known. Recently Issued and Not Adopted Accounting Standards In November 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) ASU 2023-07, Segment Reporting (Topic 280) – Improvements to Reportable Segment Disclosures , a new standard to improve reportable segment disclosures. The guidance expands the disclosures required for reportable segments in annual and interim financial statements, primarily through enhanced disclosures about significant segment expenses. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024. The Company is in the process of evaluating the impact the adoption of this ASU will have on the financial statements and related disclosures, which is not expected to be material. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures , which will require the Company to disclose specified additional information in its income tax rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold. ASU 2023-09 will also require the Company to disaggregate its income taxes paid disclosure by federal, state and foreign taxes, with further disaggregation required for significant individual jurisdictions. The provisions of ASU 2023-09 are effective for annual periods beginning after December 15, 2025; early adoption is permitted using either a prospective or retrospective transition method. The Company expects ASU 2023-09 to require additional disclosures in the notes to its financial statements. Net Loss Per Common Share The Business Combination was accounted for as a reverse recapitalization, as Legacy Oklo was determined to be the accounting acquirer under the FASB Accounting Standards Codification (“ASC”) Topic 805, Business Combinations . Accordingly, for accounting purposes, the transaction is treated as the equivalent of Legacy Oklo issuing stock for the net assets of AltC, accompanied by a recapitalization, therefore, the basic net loss has been determined utilizing the outstanding shares of the Class A common stock as described below. The Company’s basic net loss per share of Class A common stock is computed based on the average number of outstanding shares of Class A common stock for the period, by dividing the net loss by the weighted-average number of shares of Class A common stock outstanding for the period, without consideration for potential dilutive securities. Diluted net loss per share of Class A common stock is computed by dividing net loss by the weighted-average number of shares of Class A common stock and common share equivalents of potentially dilutive securities outstanding for the period. Potentially dilutive securities include stock options. Since the Company was in a loss position for the periods presented, basic net loss per share of Class A common stock is the same as diluted net loss per shares of Class A common stock since the effects of potentially dilutive securities are antidilutive. The potentially dilutive outstanding common stock equivalents of 10,432,749 options to purchase shares of Class A common stock and 1,284,062 unvested restricted common stock units have been excluded from the calculation of diluted net loss per share for the periods indicated due to their anti-dilutive effect. Emerging Growth Company Status The Company is an emerging growth company as defined in the Jumpstart Our Business Startups Act (“JOBS Act”). The JOBS Act provides emerging growth companies with certain exemptions from public company reporting requirements for up to five fiscal years while a company remains an emerging growth company. As part of these exemptions, the Company has reduced disclosure obligations such as for executive compensation, and it is not required to comply with auditor attestation requirements from Section 404(b) of the Sarbanes-Oxley Act of 2002, as amended, regarding its internal control over financial reporting. Additionally, the JOBS Act has allowed the Company the option to delay adoption of new or revised financial accounting standards until private companies are required to comply with new or revised financial accounting standards. Cash, Cash Equivalents and Marketable Securities Cash and cash equivalents include cash and highly liquid investments in money market funds with an original contractual maturity at the date of purchase of three months or less. The Company’s investments in marketable debt securities have been classified and accounted for as available-for-sale. The Company classifies its marketable debt securities as either short-term or long-term based on each instrument’s underlying contractual maturity date. The cost of marketable debt securities is adjusted for accretion of premiums and amortization of discounts to maturity. Such accretion and amortization, as well as interest and dividends, are included in interest and dividend income. The cost of securities sold is determined using the specific identification method. Unrealized gains and losses on marketable debt securities classified as available-for-sale are recognized in other comprehensive income on the condensed consolidated statements of comprehensive loss. The Company’s investments in marketable equity securities are classified based on the nature of the securities and their availability for use in current operations. The Company’s marketable equity securities, if any, are measured at fair value with gains and losses recognized in other income (loss) on the condensed consolidated statements of operations. Concentrations of Credit Risk Financial instruments that potentially subject the Company to concentration of credit risk consist primarily of cash, cash equivalents and marketable securities. The Company’s policy is to invest cash in institutional money market funds and marketable securities of the U.S. government to limit the amount of credit exposure. The Company currently maintains a portfolio of cash equivalents and marketable securities in money market funds and U.S. treasury securities. A portion of the Company’s operating cash is held in accounts in excess of the Federal Deposit Insurance Corporation insurance limits; however, the Company has established guidelines regarding diversification of its investments and their maturities, which are designed to maintain principal and maximize liquidity. The Company has not experienced any losses on cash equivalents and marketable debt securities. Property and Equipment Property and equipment are stated at cost, net of accumulated depreciation and amortization. Expenditures for repairs and maintenance that do not improve or extend the life of the assets are expensed as incurred. When property and equipment are sold or otherwise disposed of, the related cost and accumulated depreciation and amortization are removed from the respective accounts, and any resulting gains or losses are included o n the condensed consolidated statements of operations. Depreciation expense is computed using the straight-line method generally based on the following estimated useful lives of the related assets: Furniture and fixtures 7 years Computers 3 to 7 years Software 3 years Leasehold improvements Shorter of lease term or estimated useful life of the asset Impairment of Long-Lived Assets The Company reviews long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. When such events or changes in circumstances occur, the Company assesses the recoverability of long-lived assets by determining whether the carrying value of such assets will be recovered through their undiscounted expected future cash flow. If the future undiscounted cash flow is less than the carrying amount of these assets, the Company recognizes an impairment loss based on the excess of the carrying amount over the fair value of the assets. No impairment losses were recognized on any long-lived assets during the three and nine months ended September 30, 2024 and 2023. Leases The Company has lease arrangements for its offices. The Company determines if an arrangement is a lease at inception by evaluating whether the arrangement conveys the right-of-use (“ROU”) to an identified asset and whether the Company obtains substantially all of the economic benefits from and has the ability to direct the use of the asset. Leases are recorded as an operating lease right-of-use assets and operating lease liability on the condensed consolidated balance sheets. Leases with an initial term of 12 months or less are not recorded on the condensed consolidated balance sheets. Lease ROU assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. Lease ROU assets and liabilities are recognized at the commencement date based on the present value of lease payments over the expected lease term, including options to extend the lease when it is reasonably certain that the Company will exercise that option. The Company uses the discount rate implicit in the lease unless that rate cannot be readily determined. In that case, the Company uses its incremental borrowing rate, which is the rate of interest that the Company would have to pay to borrow on a collateralized basis an amount equal to the lease payments over the expected lease term. Lease ROU assets consist of the initial measurement of lease liabilities, any lease payments made to lessor on or before the lease commencement date, adjusted for any lease incentives received, and any initial direct costs incurred by the Company. Operating lease expense for lease payments is recognized on a straight-line basis over the expected lease term. There were no finance lease obligations as of September 30, 2024. Fair Value Measurements The authoritative guidance with respect to fair value established a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three levels and requires that assets and liabilities carried at fair value be classified and disclosed in one of three categories, as presented below. There are no transfers in and out of Levels 1 and 2, and activity in Level 3 fair value measurements. Financial instruments measured at fair value on a recurring basis were based upon a three-tier hierarchy as follows: Level 1: Observable inputs such as quoted prices (unadjusted) in active markets for identical assets or liabilities and investments in U.S. treasury securities and money market funds. Level 2: Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly, as corroborated by market data. Level 3: Unobservable inputs in which little or no market data exists, therefore developed using management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. The Company determines the level in the fair value hierarchy within which each fair value measurement falls in its entirety, based on the lowest level input that is significant to the fair value measurement in its entirety. In determining the appropriate levels, the Company performs an analysis of the assets and liabilities at each reporting period end. The Company’s cash and cash equivalents, prepaid expenses and other current assets, accounts payable, accrued expenses and other, and other current liabilities approximate their fair value due to the short-term nature of these assets and liabilities. The Company’s marketable debt securities are classified as Level 1 or Level 2 assets (as further described in Note 6). The Company’s SAFE Notes (as further described in Note 7) were carried at fair value and classified as Level 3 liabilities. Fair Value on a Non-Recurring Basis The fair value of the Earnout Shares and Founder Shares (both as further described in Note 3) have been estimated using the Company’s Class A common stock price at Closing, discounted based on the probability of the Earnout or Founder terms (both as further described in Note 3) being met as determined at Closing, and thus represents a Level 2 fair value measurement as defined in ASC 820, Fair Value Measurement . The Earnout Shares, if achieved, would be issued to Legacy Oklo stockholders. The Earnout Shares are a fixed number of shares to be issued to such stockholders on a pro rata basis. The fair value of the Earnout Shares and Founder Shares was recognized as a deemed dividend (as further described in Note 3). Redeemable Convertible Preferred Stock The Company had issued redeemable convertible preferred stock (the “Legacy Oklo Preferred Stock”) that converted into the Company’s Class A common stock on a one-to-one basis based on the Exchange Ratio (as described below) upon consummation of the Business Combination (further details are provided in Note 10). Given the Business Combination was treated as a reverse recapitalization, the Legacy Oklo Preferred Stock as of January 1, 2023 has been recast as Class A common stock on the condensed consolidated statements of stockholders’ equity (deficit) in accordance with the accounting for the reverse recapitalization (as further described in Note 3). Research and Development Research and development represent costs incurred to develop the Company’s technology. These costs consist of personnel costs, including salaries, employee benefit costs, bonuses and stock-based compensation expenses, software costs, computing costs, hardware and experimental supplies, and expenses for outside engineering contractors for analytical work and consulting costs, as well as depreciation and amortization expense for capitalized assets associated with these functions. The Company expenses all research and development costs in the periods in which they are incurred. General and Administrative General and administrative expenses consist primarily of payroll and other personnel-related costs, including stock-based compensation expense, for the Company’s employees involved in general corporate functions including finance and human resources, rent and other occupancy expenses, professional fees for legal and accounting, travel costs, promotional expenses, as well as depreciation and amortization expense for capitalized assets associated with these functions. Cost-Share Projects The Company has certain cost-share reimbursable projects for several research and development (“R&D”) projects related to nuclear recycling technologies awarded by the DOE’s Advanced Research Projects Agency-Energy ("ARPA-E") (the “cost-share projects”) where the Company elected to record the reimbursements on a net presentation basis in the condensed consolidated financial statements. The Company offset certain R&D expenses related to the cost-share projects totaling $240,025 and $38,928 for the three months ended September 30, 2024 and 2023, respectively, and $560,913 and $75,116 for the nine months ended September 30, 2024 and 2023, respectively, based on the period in which the expense was incurred and reimbursable under the guidelines of the cost-share project on the condensed consolidated statements of operations. The reimbursable R&D expenses included $36,238 of property and equipment purchased under the guidelines of the cost-share projects during the nine months ended September 30, 2024, and reflected $36,238 of the cost-share reimbursement as an offset to the cost basis of the property and equipment, resulting in no carrying value for the property and equipment on the condensed consolidated balance sheets and no reported cash flows. In the event the property and equipment is sold upon completion of the cost-share projects, the Company may be obligated to reimburse the DOE in the event the proceeds are in excess of $5,000 per asset, which at such time, if applicable, will be reported on a net presentation basis with no gain recognized and no cash flows. Stock-Based Compensation The Company accounts for stock-based compensation by measuring and recognizing expense for all stock-based payments made to employees and non-employees based on the estimated grant-date fair values for all stock-based compensation arrangements. The Company recognizes compensation over each recipient’s requisite service period, which is generally the vesting period. The Company has elected to recognize actual forfeitures by reducing the stock-based compensation in the same period as the forfeitures occur. The Company estimates the fair value of stock options granted to employees and non-employees using the Black-Scholes option pricing model. The Black-Scholes option pricing model requires the input of subjective assumptions, including the Legacy Oklo’s common stock fair value and the Company’s Class A common stock fair value (as further described below), expected volatility, expected dividend yield, risk-free rate of return, and the expected term. The Company classifies stock-based compensation expense in the same manner in which the award recipient’s cash compensation cost is classified on the condensed consolidated statements of operations. Common Stock Fair Value – Prior to the Closing, there was no public market for Legacy Oklo’s common stock. Therefore, Legacy Oklo’s board of directors (the “Legacy Oklo Board”) determined the fair value of Legacy Oklo’s common stock at the time of the grant of stock options by considering a number of objective and subjective factors. The fair value of the Legacy Oklo common stock was determined in accordance with applicable elements of the practice aid issued by the American Institute of Certified Public Accountants titled, “Valuation of Privately Held Company Equity Securities Issued as Compensation.” The Legacy Oklo Board granted stock options with exercise prices equal to the fair value of Legacy Oklo’s common stock on the date of grant. After the Closing, the closing price of the Class A common stock on the NYSE is used as the fair value of the Company’s Class A common stock.

Business Combination

Business Combination	9 Months Ended
Business Combination	Sep. 30, 2024
Reverse Recapitalization [Abstract]
Business Combination	Business Combination The Business Combination was accounted for as a reverse recapitalization as Legacy Oklo was determined to be the accounting acquirer. Under this method of accounting, AltC is treated as the “acquired” company for financial reporting purposes. Accordingly, for accounting purposes, the Business Combination is treated as the equivalent of Legacy Oklo issuing stock for the net assets of AltC, accompanied by a recapitalization (the “recapitalization”). The net assets of AltC are stated at historical cost, with no goodwill or other intangible assets recorded. Results of operations prior to the Business Combination are presented as belonging to Legacy Oklo. The recapitalization had no effect on reported net loss, cash flows, or total assets as previously reported. The following table reconciles the elements of the Business Combination to the condensed consolidated statements of cash flows and the condensed consolidated statements of redeemable convertible preferred stock and stockholders’ deficit for the nine months ended September 30, 2024: Cash proceeds from recapitalization $ 276,209,768 Add: accrued interest receivable 43,616 Add: advance to Legacy Oklo 1,829,659 Add: prepaid expenses 3,500 Less: transaction costs and advisor fees paid (14,661,884) Cash and other assets acquired from the Business Combination 263,424,659 Less: accounts payable (11,743) Less: accrued expenses (45,455) Less: excise tax payable (2,159,147) Less: income taxes payable (348,691) Net cash from the Business Combination recorded on the condensed consolidated statements of stockholders’ equity (deficit) $ 260,859,623 Earnout Awards In connection with the Business Combination, the Company issued the following earnout awards: Pursuant to a sponsor letter agreement (the “Sponsor Agreement”), AltC Sponsor LLC (the “Sponsor”) agreed to subject 10% of its AltC Class A common stock (received as a result of the conversion of its AltC Class B common stock (as described in Note 11) immediately prior to the Closing, such shares, the “AltC founder shares”) to vesting and forfeiture conditions relating to, among other things, price targets for the Company’s Class A common stock for a time period commencing on the Closing and ending on the earlier of (i) the five-year anniversary of the Closing Date and (ii) a Change in Control (a “Change in Control” as defined in the Merger Agreement) (such period, the “Earnout Period”). All persons that held one or more shares of Legacy Oklo common stock immediately prior to the Closing, (after giving effect to the conversion of the Legacy Oklo Preferred Stock and Legacy Oklo SAFEs (as described in Note 7)) and all persons that held one or more vested Legacy Oklo options immediately prior to the Closing are eligible (the “Eligible Legacy Oklo equityholders”) to receive an aggregate of 15,000,000 additional shares of Class A common stock (the “Earnout Shares”) in three separate tranches upon the occurrence of each Earnout Triggering Event during the Earnout Period as follows: • Earnout Triggering Event I requires the issuance of 7,500,000 Class A common stock to Eligible Legacy Oklo equityholders at the earlier of the following: (i) the stock trading price is equal to or greater than $12.00 per share for 20 trading days within a 60 consecutive trading day period or (ii) a Change in Control of Oklo pursuant to which holders of Class A common stock have the right to receive consideration implying a value per share greater than or equal to $12.00 after (a) taking into account the dilutive effect of any Earnout Shares that have been or would be issued at Earnout Triggering Event I and (b) excluding any AltC founder shares that have been or would be forfeited pursuant to the Sponsor Agreement; • Earnout Triggering Event II requires the issuance of 5,000,000 Class A common stock to Eligible Legacy Oklo equityholders at the earlier of the following: (i) the stock trading price is equal to or greater than $14.00 per share for 20 trading days within a 60 consecutive trading day period or (ii) a Change in Control of Oklo pursuant to which holders of Class A common stock have the right to receive consideration implying a value per share greater than or equal to $14.00 after (a) taking into account the dilutive effect of any Earnout Shares that have been or would be issued at Earnout Triggering Event II, and, if applicable, Earnout Triggering Event I, and (b) excluding any AltC founder shares that have been or would be forfeited pursuant to the Sponsor Agreement; and; • Earnout Triggering Event III requires the issuance of 2,500,000 Class A common stock to Eligible Legacy Oklo equityholders at the earlier of the following: (i) the stock trading price is equal to or greater than $16.00 per share for 20 trading days within a 60 consecutive trading day period or (ii) a Change in Control of Oklo pursuant to which holders of Class A common stock have the right to receive consideration implying a value per share greater than or equal to $16.00 after (a) taking into account the dilutive effect of any Earnout Shares that have been or would be issued at Earnout Triggering Event III, and, if applicable, Earnout Triggering Event I and Earnout Triggering Event II, and (b) excluding any AltC founder shares that have been or would be forfeited pursuant to the Sponsor Agreement. Each Earnout Triggering Event is subject to certain conditions and other provisions. The stock trading price, as described above, is based upon the closing price per share of Class A common stock, as quoted on the NYSE for any 20 trading days within any 60 consecutive trading day period within the Earnout Period (the “stock trading price”). If any of the Earnout Triggering Events, as described in the foregoing, are not achieved within the Earnout Period, the Earnout Shares issuable upon the occurrence of the applicable Earnout Triggering Event will be forfeited. At the Closing, the AltC founder shares unvested and will revest over a five-year period following the Closing (the “Vesting Period”), up to 12,500,000 shares of Class A common stock (the “Founder Shares”), in the aggregate in four tranches upon the occurrence of each Vesting Triggering Event as follows: • Vesting Trigger Event I requires the vesting of 6,250,000 of the Founder Shares when the stock trading price equals or exceeds $10.00 per share for 20 trading days within a 60 consecutive trading day period or in the event of a Sale (as defined in the Sponsor Agreement) of Oklo pursuant to which holders of Class A common stock paid or implied in such Sale equals or exceeds $10.00 per share; • Vesting Trigger Event II requires the vesting of 3,125,000 of the Founder Shares when the stock trading price equals or exceeds $12.00 per share for 20 trading days within a 60 consecutive trading day period or in the event of a Sale of Oklo pursuant to which holders of Class A common stock paid or implied in such Sale equals or exceeds $12.00 per share; • Vesting Trigger Event III requires the vesting of 1,562,500 of the Founder Shares when the stock trading price equals or exceeds $14.00 per share for 20 trading days within a 60 consecutive trading day period or in the event of a Sale of Oklo pursuant to which holders of Class A common stock paid or implied in such Sale equals or exceeds $14.00 per share; and • Vesting Trigger Event IV requires the vesting of 1,562,500 of the Founder Shares when the stock trading price equals or exceeds $16.00 per share for 20 trading days within a 60 consecutive trading day period or in the event of a Sale of Oklo pursuant to which holders of Class A common stock paid or implied in such Sale equals or exceeds $16.00 per share. Each Vesting Triggering Event is subject to certain conditions. In each case, the price paid or implied in such Sale will be determined after (i) taking into account the dilutive effect of any Earnout Shares that have been or would be issued at Earnout Triggering Event I, Earnout Triggering Event II and Earnout Triggering Event III, as applicable, and (ii) excluding any Founder Shares that have been or would be forfeited pursuant to the Sponsor Agreement (i.e., the unvested Founder Shares that do not vest upon the occurrence of a Sale will be forfeited immediately prior to the closing of such Sale). If any of the Vesting Triggering Events, as described in the foregoing, are not achieved within the Vesting Period, the Founder Shares will be forfeited. The Earnout Shares, exclusive of Earnout Shares attributable to the Legacy Oklo vested options at Closing, as further described below, and Founder Shares were recorded at fair value at Closing of the Business Combination and equity classified. Upon closing of the Business Combination, the estimated fair value of the Earnout Shares and Founder Shares was $261,715,800 and $226,218,800, respectively, based on a valuation using a Monte Carlo simulation with key inputs and assumptions, such as stock price at Closing of $18.23 per share, term, dividend yield, risk-free rate, and volatility. Because the Business Combination is accounted for as a reverse recapitalization, the issuance of the Earnout Shares and vesting of the Founder Shares will be treated as a deemed dividend. As the Company is in an accumulated deficit position as of the measurement date, the Company recorded the issuance of the Earnout Shares and Founder Shares in additional paid-in capital (“APIC”), with a corresponding offset recorded to APIC, resulting in a net-nil impact on the APIC balance. As of September 30, 2024, there were 15,000,000 and 12,500,000 Earnout Shares and Founder Shares, respectively, unvested and remaining subject to the vesting terms (further details are provided under the heading Vesting of Earnout Awards in Note 15). For the Earnout Shares attributable to the Legacy Oklo vested options, where each Legacy Oklo vested option holder will receive a pro rata share of the Earnout Shares as if their Legacy Oklo vested options were outstanding at the Closing of the Business Combination pursuant to the applicable Earnout Triggering Event, the condensed consolidated statement of operations reflects a noncash stock-based compensation expense of $7,784,200 representing the incremental costs of the modification of Legacy Oklo’s awards for the vested options holders’ contingent right to receive a pro rata share of the Earnout Shares recorded at the Closing. As part of the Business Combination, in the case of holders of Legacy Oklo options, each outstanding Legacy Oklo option was converted into an option to purchase, based on the Exchange Ratio (as described below), upon the same terms and conditions as were in effect with respect to the corresponding Legacy Oklo option immediately prior to the Closing, including with respect to vesting and termination-related provisions, a number of shares of Class A common stock (rounded down to the nearest whole share) equal to the product of (x) the number of Legacy Oklo common stock underlying such option immediately prior to the Closing and (y) the number of shares of Class A common stock issued in respect of each Legacy Oklo common stock in the Business Combination pursuant to the Merger Agreement, at an exercise price per share (rounded up to the nearest whole cent) equal to (A) the exercise price per Legacy Oklo common stock underlying such option immediately prior to the Closing divided by (B) the number of shares of Class A common stock issued in respect of each Legacy Oklo common stock in the Business Combination pursuant to the Merger Agreement. Upon the terms and subject to the conditions set forth in the Merger Agreement, at the Closing, the adjustments giving effect to the Business Combination and related transactions are summarized below: • the Merger of Merger Sub, the wholly owned subsidiary of AltC, with and into Legacy Oklo, with Legacy Oklo as the surviving company; • each share of Legacy Oklo common stock, including shares of Legacy Oklo common stock issued upon the pre-Closing conversion of Legacy Oklo Preferred Stock and Legacy Oklo SAFEs, was automatically surrendered and no longer exists, and was exchanged, in the aggregate, for an amount equal to $10.00 per share of Class A common stock; and • the exchange of all outstanding vested and unvested Legacy Oklo stock options into stock options exercisable for shares of Class A common stock with the same terms except for the number of shares exercisable and the exercise price, each of which was adjusted using the Exchange Ratio. At the Closing, each share of Legacy Oklo common stock issued and outstanding immediately prior to the Closing was automatically surrendered and exchanged for 78,996,459 shares of Class A common stock pursuant to the Restated Certificate of Incorporation (as further described in Note 11) and issued to the Company’s stockholders in exchange for all outstanding shares of Legacy Oklo common stock (including shares of Legacy Oklo common stock resulting from the conversion of Legacy Oklo Preferred Stock and Legacy Oklo SAFEs immediately prior to the Closing) at the exchange ratio of 6.062 (the “Exchange Ratio”) pursuant to the terms of the Merger Agreement. Further, 1,450,000 shares of Class A common stock were issued in exchange for AltC private placement shares held by the Sponsor pursuant to the Sponsor Agreement (the “AltC private placement shares”). A reserve was established for issuance up to: (i) 10,432,749 shares of Class A common stock in respect of the Legacy Oklo options assumed pursuant to the terms of the Merger Agreement; and (ii) 15,000,000 shares of Class A common stock for the potential future issuance of the Earnout Shares, as outlined above. The total number of shares of the Company’s Class A common stock outstanding immediately following the Closing of the Business Combination consisted of the following: Class A Common Stock (1) Legacy Oklo stockholders (2) 78,996,459 Sponsor stockholders (as defined in Note 11) (3) 13,950,000 AltC public stockholders (as defined in Note 11) (4) 29,149,811 Total AltC stockholders 43,099,811 Total Class A common stock 122,096,270 (1) The table does not include the 15,000,000 shares underlying the Earnout Shares and 10,432,749 shares underlying the Legacy Oklo options . (2) The table includes 70,588,565 shares issued to Legacy Oklo stockholders (consisting of (i) 39,923,611 shares issued to Legacy Oklo Preferred Stock holders (for further details see Note 10) and 28,921,953 shares issued to Legacy Oklo common stockholders as of January 1, 2023 (determined by taking the 4,771,025 shares of Legacy Oklo outstanding common stock multiplied by the Exchange Ratio of 6.062), together totaling 68,845,564 shares that represent the retroactive application of the recapitalization), (ii) 1,345,625 shares issued to holders of Legacy Oklo options upon the exercise of options during the nine months ended September 30, 2024 and (iii) 397,376 shares issued to holders of Legacy Oklo options upon the exercise of options during the year ended December 31, 2023), and 8,407,894 shares issued upon conversion of the Legacy Oklo SAFEs (for further details, see Note 7) outstanding immediately before the Business Combination, together the 70,588,565 and 8,407,894 totaling 78,996,459 . (3) The table includes 12,500,000 shares issued to the Sponsor representing the Founder Shares that will vest and no longer be subject to forfeiture pursuant to the applicable Vesting Triggering Event and 1,450,000 shares issued in exchange for AltC private placement shares held by the Sponsor pursuant to the Sponsor Agreement . (4) The AltC public stockholders represent the Class A common stock subject to redemption held by the AltC stockholders immediately before the Closing (for further details see Note 11). Transaction Costs Transaction costs consist of direct legal, consulting, audit and other fees related to the consummation of the Business Combination. These costs were initially capitalized as incurred and recorded in prepaid and other current assets as deferred issuance costs on the condensed consolidated balance sheets. Upon the Closing, transaction costs directly related to the issuance of shares of Class A common stock totaling $14,661,884, consisting of legal and professional fees, were recognized as an offset to APIC on the condensed consolidated statements of stockholders’ equity (deficit).

Balance Sheet Components

Balance Sheet Components	9 Months Ended
Balance Sheet Components	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Balance Sheet Components	Balance Sheet Components Prepaid and Other Current Assets Prepaid and other current assets are summarized as follows: As of September 30, 2024 December 31, 2023 Prepaid expense $ 2,083,117 $ 369,881 Deferred issuance costs — 3,709,542 Costs-share receivables 433,985 126,042 Accrued interest receivable 737,757 — Rent security 56,348 — Refundable deposit 125,000 125,000 Total prepaid and other current assets $ 3,436,207 $ 4,330,465 Prepaid expenses include prepaid consulting fees, insurance premiums, rent and other charges. The deferred issuance costs were specific incremental costs of the Business Combination. Cost-share receivables refer to the monetary assets obtained by the Company through several R&D cost-share projects related to nuclear recycling technologies awarded by the DOE’s ARPA-E. Refundable deposit represents an advance payment for the grant of a right to purchase certain land, subject to certain conditions. Prepaid expenses are amortized over the straight-line method over the contract term. The deferred issuance costs have been charged against the proceeds of the recapitalization. Cost-share receivables are recorded as eligible costs are incurred. The refundable deposit will either be applied to the final purchase price of the land or refunded no later than December 31, 2024. Property and Equipment, Net Property and equipment, net are summarized as follows: As of September 30, 2024 December 31, 2023 Computers and equipment $ 366,403 $ 196,882 Furniture and fixtures 90,521 64,912 Software 479,954 392,465 Leasehold improvements 30,762 30,762 Total property and equipment, gross 967,640 685,021 Less accumulated depreciation and amortization (287,770) (107,350) Total property and equipment, net $ 679,870 $ 577,671 Depreciation and amortization expenses for the three months ended September 30, 2024 and 2023 totaled $68,747 and $13,112, respectively, and for the nine months ended September 30, 2024 and 2023 totaled $180,420 and $36,514, respectively. Accrued Expenses and Other Accrued expenses and other are summarized as follows: As of September 30, 2024 December 31, 2023 Accrued expenses $ 750,288 $ 482,984 Accrued payroll and bonus 495,016 196,900 Excise tax payable 2,159,147 — Credit card liabilities 226,138 155,407 Income taxes payable 388,584 250 Total accrued expenses and other $ 4,019,173 $ 835,541

Leases

Leases	9 Months Ended
Leases	Sep. 30, 2024
Leases [Abstract]
Leases	Leases As of September 30, 2024, the Company had commercial real estate sublease agreements for 17,098 square feet of office space in Santa Clara, California, with an initial term of 28 months. The table below presents supplemental information related to operating leases: Nine Months Ended September 30, 2024 2023 Operating lease costs during the period $ 309,859 $ 225,971 Cash payments included in the measurement of operating lease liabilities during the period $ 152,880 $ 167,286 Operating lease liabilities arising from obtaining lease right-of-use assets during the period $ 1,184,913 $ — Weighted-average remaining lease term (in months) as of period-end 27 8 Weighted-average discount rate during the period 8.76% 6.85% The Company generally utilizes its incremental borrowing rates on a collateralized basis, reflecting the Company’s credit quality and the term of the lease at the commencement of the lease in determining the present value of future payments since the implicit rate for the Company’s leases is not readily determinable. Variable lease expense includes rental increases that are not fixed, such as those based on amounts paid to the lessor based on cost or consumption, such as maintenance and utilities. The components of operating lease costs were as follows: Three Months Ended Nine Months Ended 2024 2023 2024 2023 Operating lease costs: Research and development $ 86,804 $ 31,296 $ 228,422 $ 121,875 Sales, general and administrative 33,424 33,676 81,437 104,096 Total operating lease costs (1) $ 120,228 $ 64,972 $ 309,859 $ 225,971 (1) Month-to-month lease arrangements for the three months ended September 30, 2024 and 2023 of $37,339 and $14,397, respectively, and for the nine months ended September 30, 2024 and 2023 of $123,569 and $74,247, respectively, are included in operating lease costs. The minimum lease payments above do not include common area maintenance charges, which are contractual obligations under the Company’s lease, but are not fixed and can fluctuate from year to year and are expensed as incurred. Common area maintenance charges for the three months ended September 30, 2024 and 2023 of $13,668 and $39,389, respectively, and for the nine months ended September 30, 2024 and 2023 of $54,648 and $98,917, respectively, are included in operating expenses on the condensed consolidated statements of operations. Maturities of the operating lease liabilities are summarized as follows as of September 30, 2024: Year Ending December 31, 2024 (remaining three months of the year) $ 135,928 2025 549,188 2026 565,602 Minimum lease payments 1,250,718 Less imputed interest (113,899) Present value of operating lease liabilities $ 1,136,819 Current portion of operating lease liabilities $ 466,624 Noncurrent portion of operating lease liabilities 670,195 Total operating lease liabilities $ 1,136,819

Financial Instruments

Financial Instruments	9 Months Ended
Financial Instruments	Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]
Financial Instruments	Financial Instruments The following table shows the Company’s cash, cash equivalents and marketable debt securities by significant investment category as of September 30, 2024: Amortized Cost (1) Unrealized Gains (2) Fair Value Cash and Cash Equivalents Current Marketable Securities Noncurrent Marketable Securities Cash $ 5,309,330 $ — $ 5,309,330 $ 5,309,330 $ — $ — Level 1: Money market funds 86,490,424 — 86,490,424 86,490,424 — — U.S. Treasury securities 154,464,598 2,146,020 156,610,618 — 99,530,157 57,080,461 Subtotal 240,955,022 2,146,020 243,101,042 86,490,424 99,530,157 57,080,461 Level 2 (3) : Commercial paper 34,615,346 498,739 35,114,085 — 35,114,085 — Corporate debt securities 4,869,819 76,328 4,946,147 — 4,946,147 — Subtotal 39,485,165 575,067 40,060,232 — 40,060,232 — Total $ 285,749,517 $ 2,721,087 $ 288,470,604 $ 91,799,754 $ 139,590,389 $ 57,080,461 (1) There was no allowance for expected credit losses recorded on available-for-sale debt securities as of September 30, 2024. (2) There are no unrealized losses for U.S. Treasury securities, commercial paper and corporate debt securities included in the unrealized gains. (3) The valuation techniques used to measure the fair values of the Company’s Level 2 financial instruments, which generally have counterparties with high credit ratings, are based on quoted market prices or model-driven valuations using significant inputs derived from or corroborated by observable market data. The following table shows the fair value of the Company’s noncurrent marketable debt securities, by contractual maturity, as of September 30, 2024: Due within 1 year $ 139,590,389 Due after 1 year through 5 years 57,080,461 Total fair value $ 196,670,850 As of December 31, 2023, the Company’s cash and cash equivalents were $9,867,588.

Simple Agreements for Future Eq

Simple Agreements for Future Equity	9 Months Ended
Simple Agreements for Future Equity	Sep. 30, 2024
Other Liabilities Disclosure [Abstract]
Simple Agreements for Future Equity	Simple Agreements for Future Equity The Company issued simple agreements for future equity (the “Legacy Oklo SAFEs”) to investors (the “SAFE Notes”) prior to the Business Combination. The SAFE Notes allowed investors to purchase equity at a negotiated price at the time of each investor’s entry into such agreement with each investor receiving equity in the future with no set time for conversion. The SAFE Notes provided for conversion on an equity financing, as further described below, if such equity financing is consummated. The SAFE Notes generally focused on equity rounds, however, there were terms included for a liquidity event (as further described below) or dissolution event, which allowed for conversion into equity or cash at the option of the holder under certain circumstances. The Company determined that the SAFE Notes were not legal form of an outstanding share or legal form debt (i.e., no creditors’ rights), therefore, the Company evaluated the SAFE Notes to determine whether they must be classified as a liability under ASC 480, Distinguishing Liabilities from Equity. During the nine months ended September 30, 2024 and 2023, the Company issued SAFE Notes in exchange for aggregate proceeds of $10,232,000 and $11,975,000, respectively. For the nine months ended September 30, 2024, the Company received total cash proceeds of $10,232,000. For the nine months ended September 30, 2023, the Company received total cash proceeds of $11,975,000 with $340,000 of cash received from the subscription of a SAFE, for total proceeds of $12,315,000. Pursuant the terms of the SAFE Notes, upon a future equity financing involving preferred shares, SAFE Notes will settle into a number of preferred shares equal to the greater of (i) the number of shares of standard preferred stock equal to the amount invested under the SAFE Note divided by the lowest price per share of the standard preferred stock, or (ii) the invested amount of the SAFE Note divided by a discounted price to the price investors pay to purchase the standard preferred shares in the financing (with such discounted price calculated by reference to a valuation cap). Alternatively, upon the occurrence of a change of control, a direct listing or an initial public offering (described as a “liquidity event”) (other than a qualified financing), the investors had the option to receive either (i) cash payment equal to the invested amount under such SAFE Note, or (ii) a number of shares of common stock equal to the invested amount divided by the liquidity price set forth in the applicable SAFE Note. Given the SAFE Notes included a provision allowing for the investors to receive a portion of the proceeds upon a change of control equal to the greater of their investment amount or the amount payable based upon a number of shares of common stock equal to the investment amount divided by the liquidity price, the occurrence of which is outside the control of the Company, this provision required the SAFE Notes to be classified as a liability pursuant to ASC 480 because a change in control is an event that was considered not under the sole control of the Company (see Note 8). Further, if a dissolution event occurred prior to the termination of the SAFE Notes, the investors would have been entitled to receive a portion of the related proceeds equal to the purchase amount (or the amount received for the SAFE Note). In connection with and prior to the Business Combination, the Company and the SAFE Notes investors amended the SAFE Notes to convert in connection with the consummation of the Business Combination, all of which converted at the Closing as follows: Legacy Oklo SAFEs Outstanding Principal Balance of SAFE Notes Before Closing Legacy Oklo Price Per Share Upon Conversion Legacy Oklo Common Stock Issuable Exchange Ratio Class A Common Stock Issued at Closing (1) Valuation cap of $300,000,000 $ 13,994,800 $ 22.445945 623,487 6.062 3,779,578 Valuation cap of $500,000,000 28,562,200 37.409909 763,496 6.062 4,628,316 Total $ 42,557,000 1,386,983 8,407,894 (1) For further details, refer to Note 3.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
Fair Value Measurements	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The Company’s SAFE Notes were recorded at fair value on the condensed consolidated balance sheets. The fair value of the Company’s SAFE Notes were based on significant inputs not observable in the market, which cause the instrument to be classified as a Level 3 measurement with the fair value hierarchy. The valuation used probabilities considering pay-offs under various scenarios as follows: (i) an equity financing where the SAFE Notes will convert into certain preferred stock; (ii) a liquidity event (change of control, and initial public offering) where the SAFE noteholders will have an option to receive either a cash payment equal to the invested amount under such SAFE Note or a number of shares of common stock equal to the invested amount divided by the liquidity price; and (iii) dissolution event where the Legacy Oklo SAFE noteholders would be entitled to receive a portion of the related proceeds equal to the purchase amount. The Company determined the fair value of the SAFE Notes under the Monte Carlo simulation method which was used to estimate the future market value of invested capital (“MVIC”) of the Company at a liquidity event and the expected payment to the Legacy Oklo SAFE holders at each simulated MVIC value. The Company believes these assumptions would be made by a market participant in estimating the valuation of the SAFE Notes. The Company assesses these assumptions and estimates on an on-going basis as additional data impacting the assumptions and estimates are obtained. Changes in the fair value of the SAFE Notes were recognized on the condensed consolidated statements of operations. The key assumptions used in the Monte Carlo simulation are presented in the table below: Immediately Prior to the Closing As of December 31, 2023 Asset volatility (1) 83.0% 85.8% Risk-free rate (2) 4.5% 3.8% Expected term (3) 60 months 60 months (1) Asset volatility measures the uncertainty about the realization of expected future returns that was estimated based on the methodologies assuming default risk based on the implied and historical volatility of the share price of peer companies. (2) Risk-free rate based on the U.S. Treasury yield in effect at the time of SAFE Notes consistent with the expected term. (3) The simulation considers a total 5-year term. If there are no events occurring within 5 years, then the SAFE noteholders are expected to receive their principal amount. The following table presents a reconciliation of the liability measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three and nine months ended September 30, 2024: Three Months Ended Nine Months Ended Beginning balance $ — $ 46,042,000 SAFE Notes issued during the period — 10,232,000 Change in fair value during the period — 29,919,959 SAFE Notes converted during the period — (42,557,000) Change in fair value upon conversion on SAFE Notes at Closing — (43,636,959) Ending balance $ — $ — As of September 30, 2024 and December 31, 2023, the estimated fair value of the SAFE Notes were $0 and $46,042,000, respectively. The change in fair value for the three and nine months ended September 30, 2024, as reflected in the above table, is included in other income (loss) on the condensed consolidated statements of operations.

Right of First Refusal Liabilit

Right of First Refusal Liability	9 Months Ended
Right of First Refusal Liability	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Right Of First Refusal Liability	Right of First Refusal Liability On February 16, 2024, the Company entered into a letter of intent (the “LOI”) with an unrelated third party (the “third party”) for the purchase of power from the Company’s planned powerhouses to serve certain data centers in the U.S. on a 20-year timeline, and at a rate to be formally specified in one or more future Power Purchase Agreement(s) (each a “PPA”) (subject to the requirement that the price meets the market rate, discount and most favored nation terms contained in the agreement). In addition, the third party will have the right to renew and extend PPAs for additional 20-year terms.

Redeemable Convertible Preferre

Redeemable Convertible Preferred Stock	9 Months Ended
Redeemable Convertible Preferred Stock	Sep. 30, 2024
Temporary Equity Disclosure [Abstract]
Redeemable Convertible Preferred Stock	Redeemable Convertible Preferred Stock The following table presents the issuance of the Company’s Class A common stock after giving effect to the Exchange Ratio upon consummation of the Business Combination on a one-to-one basis immediately before the Closing for the issued and outstanding shares of the Legacy Oklo Preferred Stock: Preferred Stock Series Shares Issued and Outstanding Before Closing Exchange Ratio Class A Common Stock Issued at Closing Preferred Stock Series A-1 4,526,703 6.062 27,440,874 Preferred Stock Series A-2 55,135 6.062 334,228 Preferred Stock Series A-3 2,004,043 6.062 12,148,509 Totals 6,585,881 39,923,611

Stockholders' Equity

Stockholders' Equity	9 Months Ended
Stockholders' Equity	Sep. 30, 2024
Equity [Abstract]
Stockholders' Equity	Stockholders’ Equity (Deficit) The Second Amended and Restated Certificate of Incorporation dated May 9, 2024, pursuant to the Restated Certificate filed with the Secretary of the State of Delaware (the “Restated Certificate of Incorporation”), authorized the Company to issue 501,000,000 shares of all classes of capital stock consisting of (i) 500,000,000 shares of Class A common stock (further details are provided below), par value of $0.0001 per share and (ii) 1,000,000 shares of preferred stock, par value of $0.0001 per share (further details are provided below). Subject to the special rights of the holders of any outstanding series of preferred stock, the number shares of preferred stock may be increased or decreased (but not below the number of shares then outstanding) by affirmative vote of the holders of a majority of the stock of the Company entitled to vote. Class A Common Stock Pursuant to the terms of the Restated Certificate of Incorporation, immediately upon the effectiveness of the filing of the Restated Certificate of Incorporation, (i) each share of Class A common stock subject to redemption held by AltC stockholders (the “AltC public stockholders”) was reclassified on a one-for-one basis as one share of the Company’s Class A common stock, (ii) each share of AltC Class A common stock (i.e., the AltC private placement shares) held by the Sponsor was reclassified on a one-for-one basis as one share of the Company’s Class A common stock, and (iii) each share of AltC Class B common stock (i.e., the Founder Shares) held by the Sponsor was converted on a one-for-one basis into a share of Company’s Class A common stock (the “Sponsor stockholders”). The holders of Class A common stock have one vote for each share of common stock held of record by such holder as of the applicable record date. Subject to the special rights of holders of any outstanding preferred stock to elect directors, there were seven (7) directors at the time of filing the Restated Certificate of Incorporation. Thereafter, the number of directors will be exclusively fixed from time to time by resolution of a majority of the Company’s board of directors (the “Board”). Subject to the special rights of holders of any outstanding series of preferred stock to elect directors, the Board is divided into three classes with the term of each director expiring on the date of the third annual meeting of stockholders following the annual meeting of stockholders at which such director was elected, as follows: Class I, with a term expiring at the first annual meeting; Class II, with a term expiring at the second annual meeting; and Class III, with a term expiring at the third annual meeting. Reserve of Class A Common Stock – Effective May 9, 2024, the Company reserved the following shares of its Class A common stock: (i) 10,432,749 shares of Class A common stock issuable upon the exercise of outstanding options under the Oklo Inc. 2016 Stock Incentive Plan (the “Legacy Oklo 2016 Plan”); (ii) 15,872,516 shares of Class A common stock issuable for potential future awards, subject to certain annual increases commencing on January 1, 2025 and ending on January 1, 2034, under the Oklo Inc. 2024 Equity Incentive Plan (the “2024 Plan”); and (iii) 2,441,926 shares of Class A common stock authorized for future issuance, subject to certain annual increases commencing on January 1, 2025 and ending on January 1, 2034, under the Oklo Inc. 2024 Employee Stock Purchase Plan (the “2024 ESPP”). Further details of the Legacy Oklo 2016 Plan, the 2024 Plan and 2024 ESPP are described in Note 12. Issuances of Class A Common Stock – During the three and nine months ended September 30, 2024, the Company issued no and 1,345,625 shares, respectively, of its Class A common stock upon the exercise of stock options with an exercise price of $0 and $439,922, respectively. During the three and nine months ended September 30, 2023, the Company issued 133,970 and no shares, respectively, of its Class A common stock upon the exercise of stock options with an exercise price of $38,675 and $0, respectively. Preferred Stock There are no shares of preferred stock issued and outstanding. The voting, dividend and liquidation rights of the holders of the Class A common stock are subject to and qualified by the rights of the holders of the preferred stock of any series as may be designated by the Board upon any issuance of the preferred stock of any series.

Stock-based Compensation

Stock-based Compensation	9 Months Ended
Stock-based Compensation	Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]
Stock-based Compensation	Stock-based Compensation Legacy Oklo 2016 Plan – The Legacy Oklo 2016 Plan provided for the issuance of stock options, stock appreciation rights, restricted stock, restricted stock units and other stock-based awards to eligible employees, officers, consultants, advisors and directors. Since the Legacy Oklo 2016 Plan’s inception, only stock options have been awarded under it. Stock options under the Legacy Oklo 2016 Plan are subject to a maximum term of ten (10) years. Effective as of May 9, 2024, the Company is no longer issuing new awards under the Legacy Oklo 2016 Plan. As of September 30, 2024, options to purchase 10,432,749 shares of Class A common stock were outstanding under the Legacy Oklo 2016 Plan. 2024 Plan – The 2024 Plan provides for the issuance of stock options (which may be incentive stock options or nonqualified stock options) stock appreciation rights (“SARs”), restricted stock awards, restricted stock units and other stock-based awards to eligible employees, consultants, advisors and non-employee directors. Awards under the 2024 Plan cover shares of Class A common stock. Stock options and SARs granted pursuant to the 2024 Plan are subject to a maximum term of ten (10) years. The 2024 Plan will terminate automatically ten (10) years after its adoption by the Board. As of September 30, 2024, 1,351,478 restricted stock units were outstanding under the 2024 Plan, of which 67,416 have vested and 1,284,062 remain unvested. 2024 ESPP – The 2024 ESPP provides eligible employees with an opportunity to purchase Class A common stock from the Company at a pre-determined discounted price and to pay for such purchases through payroll deductions or other approved contributions during “offering periods” under the 2024 ESPP. The 2024 ESPP will terminate automatically twenty (20) years after its adoption by the Board. As of September 30, 2024, the Company had not granted any rights to purchase Class A common stock under the 2024 ESPP. Stock-based compensation expense charged to operations is summarized as follows: Three Months Ended Nine Months Ended 2024 2023 2024 2023 Research and development $ 398,153 $ 34,056 $ 7,293,541 $ 101,055 General and administrative 1,228,211 13,347 3,457,239 43,141 Total costs charged to operations (1) $ 1,626,364 $ 47,403 $ 10,750,780 $ 144,196 (1) Nine months ended September 30, 2024 includes $7,784,200 of incremental costs of the modification of Legacy Oklo’s awards for the vested options holders’ contingent right to receive a pro rata share of the Earnout Shares recorded at the Closing. As of September 30, 2024, there was approximately $19,727,841 of total unrecognized compensation expense related to outstanding unvested stock-based compensation arrangements granted under the Legacy Oklo 2016 Plan and 2024 Plan. The cost is expected to be recognized over a weighted-average period of 3.69 years.

Income Taxes

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The provision for income taxes in interim periods is determined using an estimate of the Company’s annual effective tax rate, adjusted for discrete items, if any, that arise during the period. Each quarter, the Company updates its estimate of its annual effective tax rate, and if the estimated annual effective tax rate changes, the Company makes a cumulative adjustment in such period. The quarterly provision for income taxes, and estimate of the Company’s annual effective tax rate, are subject to variation due to several factors, including variability in pre-tax income (or loss), the mix of jurisdictions to which such income relates, changes in how the Company conducts business, and tax law developments. The income tax provision effective tax rate for the three and nine months ended September 30, 2024 and 2023 was (0.6)% and 0.0%, respectively. The realization of deferred tax assets is dependent upon a variety of factors, including the generation of future taxable income, the reversal of deferred tax liabilities, and tax planning strategies. During the nine months ended September 30, 2024 and 2023, the Company recorded an income tax expense of $388,584 and $0, respectively, as a result of interest and dividend income from investments, which caused the quarterly and year-to-date effective tax rate (“ETR”) to increase from the Company’s historical annual ETR. The tax expense is composed of state current income taxes and is accounted for as a discrete tax item. Based upon the Company’s historical operating losses and the uncertainty of future taxable income, the Company had provided a valuation allowance against most of the deferred tax assets as of September 30, 2024 and 2023. As of September 30, 2024 and 2023, the Company had no uncertain tax positions or interest and penalties accrued.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Contract commitments The Company enters into contracts in the normal course of business with third-party contract research organizations, contract development and manufacturing organizations and other service providers and vendors. These contracts generally provide for termination on notice and, therefore, are cancellable contracts and not considered contractual obligations and commitments. Contingencies From time to time, the Company may become involved in litigation matters arising in the ordinary course of business. The Company is not a party to any legal proceedings, nor is it aware of any material pending or threatened litigation. There were no contingent liabilities as of September 30, 2024.

Subsequent Events

Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2024
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The Company performed an evaluation of subsequent events through the date of filing of these condensed consolidated financial statements with the SEC. Other than the below described subsequent events, there were no material subsequent events which affected, or could affect, the amounts or disclosures on the condensed consolidated financial statements. Vesting of Earnout Awards In connection with each Earnout Triggering Event and each Vesting Triggering Event (each a “Triggering Event”), which occurred between November 5, 2024 and November 13, 2024, the Company expects to issue approximately 14,700,000 shares of its Class A common stock (after taking into consideration the forfeiture for no consideration of 300,000 Earnout Shares, where the Company expects to issue an equivalent number of restricted stock units to certain employees pursuant to its 2024 Plan, the terms and conditions of which have not yet been determined) for the Earnout Shares within five business days of each Earnout Triggering Event (less applicable tax withholdings for Earnout Shares attributable to Legacy Oklo vested options) and release from vesting restrictions 12,500,000 shares of its Class A common stock for the Founder Shares upon each Vesting Triggering Event. Each Triggering Event occurred by virtue of the trading price being equal to or greater than per share price for each Triggering Event for 20 trading days within a 60 consecutive trading day period. Atomic Alchemy Acquisition On November 7, 2024, the Company entered into a term sheet (the “Term Sheet”) with Atomic Alchemy, whereby Atomic Alchemy has agreed to negotiate exclusively through a certain date, pursuant to an exclusivity agreement dated September 30, 2024 in connection with the proposed acquisition of Atomic Alchemy. The Term Sheet

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($)	3 Months Ended		6 Months Ended		9 Months Ended
Pay vs Performance Disclosure - USD ($)	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Pay vs Performance Disclosure
Net loss	$ (9,959,165)	$ (8,667,956)	$ (53,368,068)	$ (9,183,802)	$ (63,327,233)	$ (17,851,758)

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Sep. 30, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2024
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements and accompanying notes are prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial reporting. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and Articles 8 and 10 of Regulation S-X of the U.S. Securities and Exchange Commission (“SEC”). Certain information or footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted, pursuant to the rules and regulations of the SEC for interim financial reporting. Accordingly, it does not include all the information and footnotes necessary for a complete presentation of financial position, results of operations, or cash flows. The information herein should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s Registration Statement on Form S-1, as amended (File No. 333-280344), which was declared effective on September 18, 2024. In the opinion of management, the accompanying unaudited condensed consolidated financial statements include all adjustments, consisting of a normal recurring nature, which are necessary for a fair statement of the financial position, operating results, and cash flows for the periods presented.
Segments	Segments To date, the Company has viewed its financial information on an aggregate basis for the purposes of evaluating financial performance and allocating the Company’s resources. Accordingly, the Company has determined that it operates in one segment.
Principles of Consolidation	Principles of Consolidation The condensed consolidated financial statements include the Company’s accounts and those of its wholly owned subsidiaries Oklo Technologies, Inc. and Oklo Power LLC. All intercompany transactions and balances have been eliminated.
Use of Estimates	Use of Estimates
Risks And Uncertainties	Risk and Uncertainties The Company is subject to continuing risks and uncertainties in connection with the current macroeconomic environment, including as a result of inflation, instability in the global banking system, geopolitical factors, including the ongoing conflicts in Ukraine and Israel. At this point, the extent to which these effects may impact the Company’s future financial condition or results of operations is uncertain, and as of the date of issuance of these financial statements, the Company is not aware of any specific event or circumstance that would require the update of any estimates or judgments or an adjustment of the carrying value of any assets or liabilities. Given the nature of the business, the ongoing conflicts in Ukraine and Israel have not had a specific impact on the Company’s financial performance. These estimates may change as new events occur and additional information is obtained and will be recognized in the financial statements as soon as they become known.
Recently Issued and Not Adopted Accounting Standards	Recently Issued and Not Adopted Accounting Standards In November 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) ASU 2023-07, Segment Reporting (Topic 280) – Improvements to Reportable Segment Disclosures , a new standard to improve reportable segment disclosures. The guidance expands the disclosures required for reportable segments in annual and interim financial statements, primarily through enhanced disclosures about significant segment expenses. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024. The Company is in the process of evaluating the impact the adoption of this ASU will have on the financial statements and related disclosures, which is not expected to be material. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures , which will require the Company to disclose specified additional information in its income tax rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold. ASU 2023-09 will also require the Company to disaggregate its income taxes paid disclosure by federal, state and foreign taxes, with further disaggregation required for significant individual jurisdictions. The provisions of ASU 2023-09 are effective for annual periods beginning after December 15, 2025; early adoption is permitted using either a prospective or retrospective transition method. The Company expects ASU 2023-09 to require additional disclosures in the notes to its financial statements.
Net Loss Per Common Share	Net Loss Per Common Share The Business Combination was accounted for as a reverse recapitalization, as Legacy Oklo was determined to be the accounting acquirer under the FASB Accounting Standards Codification (“ASC”) Topic 805, Business Combinations . Accordingly, for accounting purposes, the transaction is treated as the equivalent of Legacy Oklo issuing stock for the net assets of AltC, accompanied by a recapitalization, therefore, the basic net loss has been determined utilizing the outstanding shares of the Class A common stock as described below. The Company’s basic net loss per share of Class A common stock is computed based on the average number of outstanding shares of Class A common stock for the period, by dividing the net loss by the weighted-average number of shares of Class A common stock outstanding for the period, without consideration for potential dilutive securities. Diluted net loss per share of Class A common stock is computed by dividing net loss by the weighted-average number of shares of Class A common stock and common share equivalents of potentially dilutive securities outstanding for the period. Potentially dilutive securities include stock options. Since the Company was in a loss position for the periods presented, basic net loss per share of Class A common stock is the same as diluted net loss per shares of Class A common stock since the effects of potentially dilutive securities are antidilutive.
Cash and Cash Equivalents	Cash, Cash Equivalents and Marketable Securities Cash and cash equivalents include cash and highly liquid investments in money market funds with an original contractual maturity at the date of purchase of three months or less. The Company’s investments in marketable debt securities have been classified and accounted for as available-for-sale. The Company classifies its marketable debt securities as either short-term or long-term based on each instrument’s underlying contractual maturity date. The cost of marketable debt securities is adjusted for accretion of premiums and amortization of discounts to maturity. Such accretion and amortization, as well as interest and dividends, are included in interest and dividend income. The cost of securities sold is determined using the specific identification method. Unrealized gains and losses on marketable debt securities classified as available-for-sale are recognized in other comprehensive income on the condensed consolidated statements of comprehensive loss. The Company’s investments in marketable equity securities are classified based on the nature of the securities and their availability for use in current operations. The Company’s marketable equity securities, if any, are measured at fair value with gains and losses recognized in other income (loss) on the condensed consolidated statements of operations.
Marketable Securities	Cash, Cash Equivalents and Marketable Securities Cash and cash equivalents include cash and highly liquid investments in money market funds with an original contractual maturity at the date of purchase of three months or less. The Company’s investments in marketable debt securities have been classified and accounted for as available-for-sale. The Company classifies its marketable debt securities as either short-term or long-term based on each instrument’s underlying contractual maturity date. The cost of marketable debt securities is adjusted for accretion of premiums and amortization of discounts to maturity. Such accretion and amortization, as well as interest and dividends, are included in interest and dividend income. The cost of securities sold is determined using the specific identification method. Unrealized gains and losses on marketable debt securities classified as available-for-sale are recognized in other comprehensive income on the condensed consolidated statements of comprehensive loss. The Company’s investments in marketable equity securities are classified based on the nature of the securities and their availability for use in current operations. The Company’s marketable equity securities, if any, are measured at fair value with gains and losses recognized in other income (loss) on the condensed consolidated statements of operations.
Concentration of Credit Risk	Concentrations of Credit Risk Financial instruments that potentially subject the Company to concentration of credit risk consist primarily of cash, cash equivalents and marketable securities. The Company’s policy is to invest cash in institutional money market funds and marketable securities of the U.S. government to limit the amount of credit exposure. The Company currently maintains a portfolio of cash equivalents and marketable securities in money market funds and U.S. treasury securities. A portion of the Company’s operating cash is held in accounts in excess of the Federal Deposit Insurance Corporation insurance limits; however, the Company has established guidelines regarding diversification of its investments and their maturities, which are designed to maintain principal and maximize liquidity. The Company has not experienced any losses on cash equivalents and marketable debt securities.
Property and Equipment	Property and Equipment Property and equipment are stated at cost, net of accumulated depreciation and amortization. Expenditures for repairs and maintenance that do not improve or extend the life of the assets are expensed as incurred. When property and equipment are sold or otherwise disposed of, the related cost and accumulated depreciation and amortization are removed from the respective accounts, and any resulting gains or losses are included o n the condensed consolidated statements of operations. Depreciation expense is computed using the straight-line method generally based on the following estimated useful lives of the related assets: Furniture and fixtures 7 years Computers 3 to 7 years Software 3 years Leasehold improvements Shorter of lease term or estimated useful life of the asset
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets
Leases	Leases The Company has lease arrangements for its offices. The Company determines if an arrangement is a lease at inception by evaluating whether the arrangement conveys the right-of-use (“ROU”) to an identified asset and whether the Company obtains substantially all of the economic benefits from and has the ability to direct the use of the asset. Leases are recorded as an operating lease right-of-use assets and operating lease liability on the condensed consolidated balance sheets. Leases with an initial term of 12 months or less are not recorded on the condensed consolidated balance sheets. Lease ROU assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. Lease ROU assets and liabilities are recognized at the commencement date based on the present value of lease payments over the expected lease term, including options to extend the lease when it is reasonably certain that the Company will exercise that option. The Company uses the discount rate implicit in the lease unless that rate cannot be readily determined. In that case, the Company uses its incremental borrowing rate, which is the rate of interest that the Company would have to pay to borrow on a collateralized basis an amount equal to the lease payments over the expected lease term. Lease ROU assets consist of the initial measurement of lease liabilities, any lease payments made to lessor on or before the lease commencement date, adjusted for any lease incentives received, and any initial direct costs incurred by the Company. Operating lease expense for lease payments is recognized on a straight-line basis over the expected lease term. There were no finance lease obligations as of September 30, 2024.
Fair Value Measurements	Fair Value Measurements The authoritative guidance with respect to fair value established a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three levels and requires that assets and liabilities carried at fair value be classified and disclosed in one of three categories, as presented below. There are no transfers in and out of Levels 1 and 2, and activity in Level 3 fair value measurements. Financial instruments measured at fair value on a recurring basis were based upon a three-tier hierarchy as follows: Level 1: Observable inputs such as quoted prices (unadjusted) in active markets for identical assets or liabilities and investments in U.S. treasury securities and money market funds. Level 2: Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly, as corroborated by market data. Level 3: Unobservable inputs in which little or no market data exists, therefore developed using management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. The Company determines the level in the fair value hierarchy within which each fair value measurement falls in its entirety, based on the lowest level input that is significant to the fair value measurement in its entirety. In determining the appropriate levels, the Company performs an analysis of the assets and liabilities at each reporting period end. The Company’s cash and cash equivalents, prepaid expenses and other current assets, accounts payable, accrued expenses and other, and other current liabilities approximate their fair value due to the short-term nature of these assets and liabilities. The Company’s marketable debt securities are classified as Level 1 or Level 2 assets (as further described in Note 6). The Company’s SAFE Notes (as further described in Note 7) were carried at fair value and classified as Level 3 liabilities. Fair Value on a Non-Recurring Basis The fair value of the Earnout Shares and Founder Shares (both as further described in Note 3) have been estimated using the Company’s Class A common stock price at Closing, discounted based on the probability of the Earnout or Founder terms (both as further described in Note 3) being met as determined at Closing, and thus represents a Level 2 fair value measurement as defined in ASC 820, Fair Value Measurement . The Earnout Shares, if achieved, would be issued to Legacy Oklo stockholders. The Earnout Shares are a fixed number of shares to be issued to such stockholders on a pro rata basis. The fair value of the Earnout Shares and Founder Shares was recognized as a deemed dividend (as further described in Note 3).
Redeemable Convertible Preferred Stock	Redeemable Convertible Preferred Stock The Company had issued redeemable convertible preferred stock (the “Legacy Oklo Preferred Stock”) that converted into the Company’s Class A common stock on a one-to-one basis based on the Exchange Ratio (as described below) upon consummation of the Business Combination (further details are provided in Note 10). Given the Business Combination was treated as a reverse recapitalization, the Legacy Oklo Preferred Stock as of January 1, 2023 has been recast as Class A common stock on the condensed consolidated statements of stockholders’ equity (deficit) in accordance with the accounting for the reverse recapitalization (as further described in Note 3).
Research and Development	Research and Development Research and development represent costs incurred to develop the Company’s technology. These costs consist of personnel costs, including salaries, employee benefit costs, bonuses and stock-based compensation expenses, software costs, computing costs, hardware and experimental supplies, and expenses for outside engineering contractors for analytical work and consulting costs, as well as depreciation and amortization expense for capitalized assets associated with these functions. The Company expenses all research and development costs in the periods in which they are incurred.
General and Administrative	General and Administrative General and administrative expenses consist primarily of payroll and other personnel-related costs, including stock-based compensation expense, for the Company’s employees involved in general corporate functions including finance and human resources, rent and other occupancy expenses, professional fees for legal and accounting, travel costs, promotional expenses, as well as depreciation and amortization expense for capitalized assets associated with these functions.
Cost-Share Projects	Cost-Share Projects The Company has certain cost-share reimbursable projects for several research and development (“R&D”) projects related to nuclear recycling technologies awarded by the DOE’s Advanced Research Projects Agency-Energy ("ARPA-E") (the “cost-share projects”) where the Company elected to record the reimbursements on a net presentation basis in the condensed consolidated financial statements. The Company offset certain R&D expenses related to the cost-share projects totaling $240,025 and $38,928 for the three months ended September 30, 2024 and 2023, respectively, and $560,913 and $75,116 for the nine months ended September 30, 2024 and 2023, respectively, based on the period in which the expense was incurred and reimbursable under the guidelines of the cost-share project on the condensed consolidated statements of operations. The reimbursable R&D expenses included $36,238 of property and equipment purchased under the guidelines of the cost-share projects during the nine months ended September 30, 2024, and reflected $36,238 of the cost-share reimbursement as an offset to the cost basis of the property and equipment, resulting in no carrying value for the property and equipment on the condensed consolidated balance sheets and no reported cash flows. In the event the property and equipment is sold upon completion of the cost-share projects, the Company may be obligated to reimburse the DOE in the event the proceeds are in excess of $5,000 per asset, which at such time, if applicable, will be reported on a net presentation basis with no gain recognized and no cash flows.
Stock-Based Compensation	Stock-Based Compensation The Company accounts for stock-based compensation by measuring and recognizing expense for all stock-based payments made to employees and non-employees based on the estimated grant-date fair values for all stock-based compensation arrangements. The Company recognizes compensation over each recipient’s requisite service period, which is generally the vesting period. The Company has elected to recognize actual forfeitures by reducing the stock-based compensation in the same period as the forfeitures occur. The Company estimates the fair value of stock options granted to employees and non-employees using the Black-Scholes option pricing model. The Black-Scholes option pricing model requires the input of subjective assumptions, including the Legacy Oklo’s common stock fair value and the Company’s Class A common stock fair value (as further described below), expected volatility, expected dividend yield, risk-free rate of return, and the expected term. The Company classifies stock-based compensation expense in the same manner in which the award recipient’s cash compensation cost is classified on the condensed consolidated statements of operations. Common Stock Fair Value – Prior to the Closing, there was no public market for Legacy Oklo’s common stock. Therefore, Legacy Oklo’s board of directors (the “Legacy Oklo Board”) determined the fair value of Legacy Oklo’s common stock at the time of the grant of stock options by considering a number of objective and subjective factors. The fair value of the Legacy Oklo common stock was determined in accordance with applicable elements of the practice aid issued by the American Institute of Certified Public Accountants titled, “Valuation of Privately Held Company Equity Securities Issued as Compensation.” The Legacy Oklo Board granted stock options with exercise prices equal to the fair value of Legacy Oklo’s common stock on the date of grant. After the Closing, the closing price of the Class A common stock on the NYSE is used as the fair value of the Company’s Class A common stock.
Fair Value Measurement	Fair Value Measurements The Company’s SAFE Notes were recorded at fair value on the condensed consolidated balance sheets. The fair value of the Company’s SAFE Notes were based on significant inputs not observable in the market, which cause the instrument to be classified as a Level 3 measurement with the fair value hierarchy. The valuation used probabilities considering pay-offs under various scenarios as follows: (i) an equity financing where the SAFE Notes will convert into certain preferred stock; (ii) a liquidity event (change of control, and initial public offering) where the SAFE noteholders will have an option to receive either a cash payment equal to the invested amount under such SAFE Note or a number of shares of common stock equal to the invested amount divided by the liquidity price; and (iii) dissolution event where the Legacy Oklo SAFE noteholders would be entitled to receive a portion of the related proceeds equal to the purchase amount. The Company determined the fair value of the SAFE Notes under the Monte Carlo simulation method which was used to estimate the future market value of invested capital (“MVIC”) of the Company at a liquidity event and the expected payment to the Legacy Oklo SAFE holders at each simulated MVIC value. The Company believes these assumptions would be made by a market participant in estimating the valuation of the SAFE Notes. The Company assesses these assumptions and estimates on an on-going basis as additional data impacting the assumptions and estimates are obtained. Changes in the fair value of the SAFE Notes were recognized on the condensed consolidated statements of operations.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	9 Months Ended
Summary of Significant Accounting Policies (Tables)	Sep. 30, 2024
Accounting Policies [Abstract]
Schedule of Finite-Lived Intangible Assets	Depreciation expense is computed using the straight-line method generally based on the following estimated useful lives of the related assets: Furniture and fixtures 7 years Computers 3 to 7 years Software 3 years Leasehold improvements Shorter of lease term or estimated useful life of the asset

Business Combination (Tables)

Business Combination (Tables)	9 Months Ended
Business Combination (Tables)	Sep. 30, 2024
Reverse Recapitalization [Abstract]
Schedule of Reverse Recapitalization	The following table reconciles the elements of the Business Combination to the condensed consolidated statements of cash flows and the condensed consolidated statements of redeemable convertible preferred stock and stockholders’ deficit for the nine months ended September 30, 2024: Cash proceeds from recapitalization $ 276,209,768 Add: accrued interest receivable 43,616 Add: advance to Legacy Oklo 1,829,659 Add: prepaid expenses 3,500 Less: transaction costs and advisor fees paid (14,661,884) Cash and other assets acquired from the Business Combination 263,424,659 Less: accounts payable (11,743) Less: accrued expenses (45,455) Less: excise tax payable (2,159,147) Less: income taxes payable (348,691) Net cash from the Business Combination recorded on the condensed consolidated statements of stockholders’ equity (deficit) $ 260,859,623 The total number of shares of the Company’s Class A common stock outstanding immediately following the Closing of the Business Combination consisted of the following: Class A Common Stock (1) Legacy Oklo stockholders (2) 78,996,459 Sponsor stockholders (as defined in Note 11) (3) 13,950,000 AltC public stockholders (as defined in Note 11) (4) 29,149,811 Total AltC stockholders 43,099,811 Total Class A common stock 122,096,270 (1) The table does not include the 15,000,000 shares underlying the Earnout Shares and 10,432,749 shares underlying the Legacy Oklo options . (2) The table includes 70,588,565 shares issued to Legacy Oklo stockholders (consisting of (i) 39,923,611 shares issued to Legacy Oklo Preferred Stock holders (for further details see Note 10) and 28,921,953 shares issued to Legacy Oklo common stockholders as of January 1, 2023 (determined by taking the 4,771,025 shares of Legacy Oklo outstanding common stock multiplied by the Exchange Ratio of 6.062), together totaling 68,845,564 shares that represent the retroactive application of the recapitalization), (ii) 1,345,625 shares issued to holders of Legacy Oklo options upon the exercise of options during the nine months ended September 30, 2024 and (iii) 397,376 shares issued to holders of Legacy Oklo options upon the exercise of options during the year ended December 31, 2023), and 8,407,894 shares issued upon conversion of the Legacy Oklo SAFEs (for further details, see Note 7) outstanding immediately before the Business Combination, together the 70,588,565 and 8,407,894 totaling 78,996,459 . (3) The table includes 12,500,000 shares issued to the Sponsor representing the Founder Shares that will vest and no longer be subject to forfeiture pursuant to the applicable Vesting Triggering Event and 1,450,000 shares issued in exchange for AltC private placement shares held by the Sponsor pursuant to the Sponsor Agreement . (4) The AltC public stockholders represent the Class A common stock subject to redemption held by the AltC stockholders immediately before the Closing (for further details see Note 11). In connection with and prior to the Business Combination, the Company and the SAFE Notes investors amended the SAFE Notes to convert in connection with the consummation of the Business Combination, all of which converted at the Closing as follows: Legacy Oklo SAFEs Outstanding Principal Balance of SAFE Notes Before Closing Legacy Oklo Price Per Share Upon Conversion Legacy Oklo Common Stock Issuable Exchange Ratio Class A Common Stock Issued at Closing (1) Valuation cap of $300,000,000 $ 13,994,800 $ 22.445945 623,487 6.062 3,779,578 Valuation cap of $500,000,000 28,562,200 37.409909 763,496 6.062 4,628,316 Total $ 42,557,000 1,386,983 8,407,894 (1) For further details, refer to Note 3.

Balance Sheet Components (Table

Balance Sheet Components (Tables)	9 Months Ended
Balance Sheet Components (Tables)	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Other Current Assets	Prepaid and other current assets are summarized as follows: As of September 30, 2024 December 31, 2023 Prepaid expense $ 2,083,117 $ 369,881 Deferred issuance costs — 3,709,542 Costs-share receivables 433,985 126,042 Accrued interest receivable 737,757 — Rent security 56,348 — Refundable deposit 125,000 125,000 Total prepaid and other current assets $ 3,436,207 $ 4,330,465
Property, Plant and Equipment	Property and equipment, net are summarized as follows: As of September 30, 2024 December 31, 2023 Computers and equipment $ 366,403 $ 196,882 Furniture and fixtures 90,521 64,912 Software 479,954 392,465 Leasehold improvements 30,762 30,762 Total property and equipment, gross 967,640 685,021 Less accumulated depreciation and amortization (287,770) (107,350) Total property and equipment, net $ 679,870 $ 577,671
Schedule of Accrued Liabilities	Accrued expenses and other are summarized as follows: As of September 30, 2024 December 31, 2023 Accrued expenses $ 750,288 $ 482,984 Accrued payroll and bonus 495,016 196,900 Excise tax payable 2,159,147 — Credit card liabilities 226,138 155,407 Income taxes payable 388,584 250 Total accrued expenses and other $ 4,019,173 $ 835,541

Leases (Tables)

Leases (Tables)	9 Months Ended
Leases (Tables)	Sep. 30, 2024
Leases [Abstract]
Lease, Cost	The table below presents supplemental information related to operating leases: Nine Months Ended September 30, 2024 2023 Operating lease costs during the period $ 309,859 $ 225,971 Cash payments included in the measurement of operating lease liabilities during the period $ 152,880 $ 167,286 Operating lease liabilities arising from obtaining lease right-of-use assets during the period $ 1,184,913 $ — Weighted-average remaining lease term (in months) as of period-end 27 8 Weighted-average discount rate during the period 8.76% 6.85% The components of operating lease costs were as follows: Three Months Ended Nine Months Ended 2024 2023 2024 2023 Operating lease costs: Research and development $ 86,804 $ 31,296 $ 228,422 $ 121,875 Sales, general and administrative 33,424 33,676 81,437 104,096 Total operating lease costs (1) $ 120,228 $ 64,972 $ 309,859 $ 225,971 (1)
Lessee, Operating Lease, Liability, to be Paid, Maturity	Maturities of the operating lease liabilities are summarized as follows as of September 30, 2024: Year Ending December 31, 2024 (remaining three months of the year) $ 135,928 2025 549,188 2026 565,602 Minimum lease payments 1,250,718 Less imputed interest (113,899) Present value of operating lease liabilities $ 1,136,819 Current portion of operating lease liabilities $ 466,624 Noncurrent portion of operating lease liabilities 670,195 Total operating lease liabilities $ 1,136,819

Financial Instruments (Tables)

Financial Instruments (Tables)	9 Months Ended
Financial Instruments (Tables)	Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]
Fair Value, by Balance Sheet Grouping	The following table shows the Company’s cash, cash equivalents and marketable debt securities by significant investment category as of September 30, 2024: Amortized Cost (1) Unrealized Gains (2) Fair Value Cash and Cash Equivalents Current Marketable Securities Noncurrent Marketable Securities Cash $ 5,309,330 $ — $ 5,309,330 $ 5,309,330 $ — $ — Level 1: Money market funds 86,490,424 — 86,490,424 86,490,424 — — U.S. Treasury securities 154,464,598 2,146,020 156,610,618 — 99,530,157 57,080,461 Subtotal 240,955,022 2,146,020 243,101,042 86,490,424 99,530,157 57,080,461 Level 2 (3) : Commercial paper 34,615,346 498,739 35,114,085 — 35,114,085 — Corporate debt securities 4,869,819 76,328 4,946,147 — 4,946,147 — Subtotal 39,485,165 575,067 40,060,232 — 40,060,232 — Total $ 285,749,517 $ 2,721,087 $ 288,470,604 $ 91,799,754 $ 139,590,389 $ 57,080,461 (1) There was no allowance for expected credit losses recorded on available-for-sale debt securities as of September 30, 2024. (2) There are no unrealized losses for U.S. Treasury securities, commercial paper and corporate debt securities included in the unrealized gains. (3) The valuation techniques used to measure the fair values of the Company’s Level 2 financial instruments, which generally have counterparties with high credit ratings, are based on quoted market prices or model-driven valuations using significant inputs derived from or corroborated by observable market data.
Debt Securities, Available-for-Sale	The following table shows the fair value of the Company’s noncurrent marketable debt securities, by contractual maturity, as of September 30, 2024: Due within 1 year $ 139,590,389 Due after 1 year through 5 years 57,080,461 Total fair value $ 196,670,850

Simple Agreements for Future _2

Simple Agreements for Future Equity (Tables)	9 Months Ended
Simple Agreements for Future Equity (Tables)	Sep. 30, 2024
Other Liabilities Disclosure [Abstract]
Schedule of Reverse Recapitalization	The following table reconciles the elements of the Business Combination to the condensed consolidated statements of cash flows and the condensed consolidated statements of redeemable convertible preferred stock and stockholders’ deficit for the nine months ended September 30, 2024: Cash proceeds from recapitalization $ 276,209,768 Add: accrued interest receivable 43,616 Add: advance to Legacy Oklo 1,829,659 Add: prepaid expenses 3,500 Less: transaction costs and advisor fees paid (14,661,884) Cash and other assets acquired from the Business Combination 263,424,659 Less: accounts payable (11,743) Less: accrued expenses (45,455) Less: excise tax payable (2,159,147) Less: income taxes payable (348,691) Net cash from the Business Combination recorded on the condensed consolidated statements of stockholders’ equity (deficit) $ 260,859,623 The total number of shares of the Company’s Class A common stock outstanding immediately following the Closing of the Business Combination consisted of the following: Class A Common Stock (1) Legacy Oklo stockholders (2) 78,996,459 Sponsor stockholders (as defined in Note 11) (3) 13,950,000 AltC public stockholders (as defined in Note 11) (4) 29,149,811 Total AltC stockholders 43,099,811 Total Class A common stock 122,096,270 (1) The table does not include the 15,000,000 shares underlying the Earnout Shares and 10,432,749 shares underlying the Legacy Oklo options . (2) The table includes 70,588,565 shares issued to Legacy Oklo stockholders (consisting of (i) 39,923,611 shares issued to Legacy Oklo Preferred Stock holders (for further details see Note 10) and 28,921,953 shares issued to Legacy Oklo common stockholders as of January 1, 2023 (determined by taking the 4,771,025 shares of Legacy Oklo outstanding common stock multiplied by the Exchange Ratio of 6.062), together totaling 68,845,564 shares that represent the retroactive application of the recapitalization), (ii) 1,345,625 shares issued to holders of Legacy Oklo options upon the exercise of options during the nine months ended September 30, 2024 and (iii) 397,376 shares issued to holders of Legacy Oklo options upon the exercise of options during the year ended December 31, 2023), and 8,407,894 shares issued upon conversion of the Legacy Oklo SAFEs (for further details, see Note 7) outstanding immediately before the Business Combination, together the 70,588,565 and 8,407,894 totaling 78,996,459 . (3) The table includes 12,500,000 shares issued to the Sponsor representing the Founder Shares that will vest and no longer be subject to forfeiture pursuant to the applicable Vesting Triggering Event and 1,450,000 shares issued in exchange for AltC private placement shares held by the Sponsor pursuant to the Sponsor Agreement . (4) The AltC public stockholders represent the Class A common stock subject to redemption held by the AltC stockholders immediately before the Closing (for further details see Note 11). In connection with and prior to the Business Combination, the Company and the SAFE Notes investors amended the SAFE Notes to convert in connection with the consummation of the Business Combination, all of which converted at the Closing as follows: Legacy Oklo SAFEs Outstanding Principal Balance of SAFE Notes Before Closing Legacy Oklo Price Per Share Upon Conversion Legacy Oklo Common Stock Issuable Exchange Ratio Class A Common Stock Issued at Closing (1) Valuation cap of $300,000,000 $ 13,994,800 $ 22.445945 623,487 6.062 3,779,578 Valuation cap of $500,000,000 28,562,200 37.409909 763,496 6.062 4,628,316 Total $ 42,557,000 1,386,983 8,407,894 (1) For further details, refer to Note 3.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
Fair Value Measurements (Tables)	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Fair Value Measurement Inputs and Valuation Techniques	The key assumptions used in the Monte Carlo simulation are presented in the table below: Immediately Prior to the Closing As of December 31, 2023 Asset volatility (1) 83.0% 85.8% Risk-free rate (2) 4.5% 3.8% Expected term (3) 60 months 60 months (1) Asset volatility measures the uncertainty about the realization of expected future returns that was estimated based on the methodologies assuming default risk based on the implied and historical volatility of the share price of peer companies. (2) Risk-free rate based on the U.S. Treasury yield in effect at the time of SAFE Notes consistent with the expected term. (3) The simulation considers a total 5-year term. If there are no events occurring within 5 years, then the SAFE noteholders are expected to receive their principal amount.
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation	The following table presents a reconciliation of the liability measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three and nine months ended September 30, 2024: Three Months Ended Nine Months Ended Beginning balance $ — $ 46,042,000 SAFE Notes issued during the period — 10,232,000 Change in fair value during the period — 29,919,959 SAFE Notes converted during the period — (42,557,000) Change in fair value upon conversion on SAFE Notes at Closing — (43,636,959) Ending balance $ — $ —

Redeemable Convertible Prefer_2

Redeemable Convertible Preferred Stock (Tables)	9 Months Ended
Redeemable Convertible Preferred Stock (Tables)	Sep. 30, 2024
Temporary Equity Disclosure [Abstract]
Schedule of Convertible Preferred Stock	The following table presents the issuance of the Company’s Class A common stock after giving effect to the Exchange Ratio upon consummation of the Business Combination on a one-to-one basis immediately before the Closing for the issued and outstanding shares of the Legacy Oklo Preferred Stock: Preferred Stock Series Shares Issued and Outstanding Before Closing Exchange Ratio Class A Common Stock Issued at Closing Preferred Stock Series A-1 4,526,703 6.062 27,440,874 Preferred Stock Series A-2 55,135 6.062 334,228 Preferred Stock Series A-3 2,004,043 6.062 12,148,509 Totals 6,585,881 39,923,611

Stock-based Compensation (Table

Stock-based Compensation (Tables)	9 Months Ended
Stock-based Compensation (Tables)	Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]
Share-Based Payment Arrangement, Expensed and Capitalized, Amount	Stock-based compensation expense charged to operations is summarized as follows: Three Months Ended Nine Months Ended 2024 2023 2024 2023 Research and development $ 398,153 $ 34,056 $ 7,293,541 $ 101,055 General and administrative 1,228,211 13,347 3,457,239 43,141 Total costs charged to operations (1) $ 1,626,364 $ 47,403 $ 10,750,780 $ 144,196 (1) Nine months ended September 30, 2024 includes $7,784,200 of incremental costs of the modification of Legacy Oklo’s awards for the vested options holders’ contingent right to receive a pro rata share of the Earnout Shares recorded at the Closing.

Nature of Operations and Orga_2

Nature of Operations and Organization (Details)	3 Months Ended		6 Months Ended		9 Months Ended
Nature of Operations and Organization (Details)	Sep. 30, 2024 USD ($) MWd	Sep. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) MWd	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	[1]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Powerhouse production capability, fresh fuel \| MWd	50				50
Powerhouse production capability, nuclear fuel \| MWd	15				15
Powerhouse useful life	30 years				30 years
Assets, fair value	$ 288,470,604				$ 288,470,604
Net loss	9,959,165	$ 8,667,956	$ 53,368,068	$ 9,183,802	63,327,233	$ 17,851,758
Operating income (loss)	(12,281,088)	$ (4,663,795)			(37,422,453)	(11,353,059)
Net cash used in operating activities					24,920,638	$ 10,373,637
Accumulated deficit	$ 124,820,677				$ 124,820,677		$ 61,493,444

[1] (1) Derived from audited financial statements.

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) segment shares	Sep. 30, 2023 USD ($)
Accounting Policies [Abstract]
Number of operating segments \| segment			1
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Impairment, long-lived asset	$ 0	$ 0	$ 0	$ 0
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Cost share R&D expenses, gross	240,025	$ 38,928	560,913	$ 75,116
Cost-share proceeds threshold per asset	$ 5,000		5,000
Cost Share Project, Property and Equipment Purchases
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Cost share R&D expenses, gross			$ 36,238
Employee Stock Option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from earnings per share (in shares) \| shares			10,432,749
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from earnings per share (in shares) \| shares			1,284,062

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Schedule of Finite-Lived Intangible Assets (Details)	Sep. 30, 2024
Furniture and fixtures
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life	7 years
Computers \| Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life	3 years
Computers \| Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life	7 years
Software
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life	3 years

Business Combination - Reconcil

Business Combination - Reconciliation of Business Elements (Details) - USD ($)	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Reverse Recapitalization [Abstract]
Cash proceeds from recapitalization	$ 276,209,768	$ 0
Add: accrued interest receivable	43,616
Add: advance to Legacy Oklo	1,829,659
Add: prepaid expenses	3,500
Less: transaction costs and advisor fees paid	(14,661,884)
Cash and other assets acquired from the Business Combination	263,424,659
Less: accounts payable	(11,743)
Less: accrued expenses	(45,455)
Less: excise tax payable	(2,159,147)
Less: income taxes payable	(348,691)
Net cash from the Business Combination recorded on the condensed consolidated statements of stockholders’ equity (deficit)	$ 260,859,623

Business Combination - Earnout

Business Combination - Earnout Awards (Details)			9 Months Ended
Business Combination - Earnout Awards (Details)	May 09, 2024 day trache $ / shares shares	May 08, 2024 shares	Sep. 30, 2024 USD ($) shares	Sep. 30, 2023 USD ($)
Reverse Recapitalization [Line Items]
Recapitalization, equity subjected	10%
Recapitalization vesting period	5 years
Contingent consideration, (in shares) \| shares	15,000,000	78,996,459
Stock price threshold (in dollars per share) \| $ / shares	$ 10
Trading day threshold	20
Trading day period	60
Stock-based compensation \| $			$ 10,750,780	$ 144,196
Recapitalization exchange ratio	6.062
Common Class A
Reverse Recapitalization [Line Items]
Reserved for future issuance (in shares) \| shares	10,432,749
Common Class A \| Employee Stock Option
Reverse Recapitalization [Line Items]
Reserved for future issuance (in shares) \| shares	10,432,749
Measurement Input, Share Price
Reverse Recapitalization [Line Items]
Measurement input	18.23
Earnout Shares
Reverse Recapitalization [Line Items]
Vesting tranches \| trache	3
Earnout shares fair value \| $			$ 261,715,800
Unvested, fair value (in shares) \| shares			15,000,000
Stock-based compensation \| $			$ 7,784,200
Founder Shares
Reverse Recapitalization [Line Items]
Recapitalization vesting period	5 years
Contingent consideration, (in shares) \| shares	1,450,000
Vesting tranches \| trache	4
Vesting per triggering event (in shares) \| shares	12,500,000
Earnout shares fair value \| $			$ 226,218,800
Unvested, fair value (in shares) \| shares			12,500,000
Reverse Recapitalization Earnout Triggering Event One \| Earnout Shares
Reverse Recapitalization [Line Items]
Contingent consideration, (in shares) \| shares	7,500,000
Stock price threshold (in dollars per share) \| $ / shares	$ 12
Trading day threshold	20
Trading day period	60
Reverse Recapitalization Earnout Triggering Event One \| Founder Shares
Reverse Recapitalization [Line Items]
Contingent consideration, (in shares) \| shares	6,250,000
Stock price threshold (in dollars per share) \| $ / shares	$ 10
Trading day threshold	20
Trading day period	60
Reverse Recapitalization Earnout Triggering Event Two \| Earnout Shares
Reverse Recapitalization [Line Items]
Contingent consideration, (in shares) \| shares	5,000,000
Stock price threshold (in dollars per share) \| $ / shares	$ 14
Trading day threshold	20
Trading day period	60
Reverse Recapitalization Earnout Triggering Event Two \| Founder Shares
Reverse Recapitalization [Line Items]
Contingent consideration, (in shares) \| shares	3,125,000
Stock price threshold (in dollars per share) \| $ / shares	$ 12
Trading day threshold	20
Trading day period	60
Reverse Recapitalization Earnout Triggering Event Three \| Earnout Shares
Reverse Recapitalization [Line Items]
Contingent consideration, (in shares) \| shares	2,500,000
Stock price threshold (in dollars per share) \| $ / shares	$ 16
Trading day threshold	20
Trading day period	60
Reverse Recapitalization Earnout Triggering Event Three \| Founder Shares
Reverse Recapitalization [Line Items]
Contingent consideration, (in shares) \| shares	1,562,500
Stock price threshold (in dollars per share) \| $ / shares	$ 14
Trading day threshold	20
Trading day period	60
Reverse Recapitalization Earnout Triggering Event Four \| Founder Shares
Reverse Recapitalization [Line Items]
Contingent consideration, (in shares) \| shares	1,562,500
Stock price threshold (in dollars per share) \| $ / shares	$ 16
Trading day threshold	20
Trading day period	60

Business Combination - Shares O

Business Combination - Shares Outstanding Following the Closing of Business Combination (Details) - shares	May 09, 2024	May 08, 2024	Sep. 30, 2024	Dec. 31, 2023
Reverse Recapitalization [Line Items]
Common stock, outstanding (in shares)	122,096,270	1,386,983	122,096,270	69,242,940
Contingent consideration, (in shares)	15,000,000	78,996,459
Common Class A
Reverse Recapitalization [Line Items]
Reserved for future issuance (in shares)	10,432,749
Common Class A \| Employee Stock Option
Reverse Recapitalization [Line Items]
Reserved for future issuance (in shares)	10,432,749
Legacy Oklo Stock Holders
Reverse Recapitalization [Line Items]
Common stock, outstanding (in shares)	78,996,459
Legacy Oklo Stockholders, Excluding SAFE Conversion
Reverse Recapitalization [Line Items]
Common stock, outstanding (in shares)	70,588,565
Legacy Oklo Stockholders, Preferred And Common
Reverse Recapitalization [Line Items]
Common stock, outstanding (in shares)	68,845,564
Legacy Oklo Preferred Stock Holders
Reverse Recapitalization [Line Items]
Common stock, outstanding (in shares)	39,923,611
Legacy Oklo Common Stock Holders
Reverse Recapitalization [Line Items]
Common stock, outstanding (in shares)	28,921,953
Legacy Oklo Common Stock Holders \| Previously Reported
Reverse Recapitalization [Line Items]
Common stock, outstanding (in shares)		4,771,025
Legacy Oklo Option Holders, Exercised 2024
Reverse Recapitalization [Line Items]
Common stock, outstanding (in shares)	1,345,625
Legacy Oklo Option Holders, Exercised 2023
Reverse Recapitalization [Line Items]
Common stock, outstanding (in shares)	397,376
Legacy Oklo Stockholders, SAFE Conversion
Reverse Recapitalization [Line Items]
Common stock, outstanding (in shares)	8,407,894
AltC Stockholders
Reverse Recapitalization [Line Items]
Common stock, outstanding (in shares)	43,099,811
Sponsor Stockholders
Reverse Recapitalization [Line Items]
Common stock, outstanding (in shares)	13,950,000
AltC Public Stockholders
Reverse Recapitalization [Line Items]
Common stock, outstanding (in shares)	29,149,811
Sponsor Stockholders, Not Subject To Forfeiture
Reverse Recapitalization [Line Items]
Common stock, outstanding (in shares)	12,500,000
Sponsor Stockholders, Prior AltC Shareholders
Reverse Recapitalization [Line Items]
Common stock, outstanding (in shares)	1,450,000

Business Combination - Transact

Business Combination - Transaction Costs (Details)	9 Months Ended
Business Combination - Transaction Costs (Details)	Sep. 30, 2024 USD ($)
Reverse Recapitalization [Abstract]
Transaction costs	$ 14,661,884

Balance Sheet Components - Prep

Balance Sheet Components - Prepaid and Other Current Assets (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Prepaid expense	$ 2,083,117	$ 369,881
Deferred issuance costs	0	3,709,542
Costs-share receivables	433,985	126,042
Accrued interest receivable	737,757	0
Rent security	56,348	0
Refundable deposit	125,000	125,000
Total prepaid and other current assets	$ 3,436,207	$ 4,330,465	[1]

[1] (1) Derived from audited financial statements.

Balance Sheet Components - Prop

Balance Sheet Components - Property and Equipment, Net (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 967,640	$ 685,021
Less accumulated depreciation and amortization	(287,770)	(107,350)
Property and equipment, net	679,870	577,671	[1]
Computers and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	366,403	196,882
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	90,521	64,912
Software
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	479,954	392,465
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 30,762	$ 30,762

[1] (1) Derived from audited financial statements.

Balance Sheet Components- Narra

Balance Sheet Components- Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
Balance Sheet Components- Narrative (Details) - USD ($)	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Depreciation	$ 68,747	$ 13,112	$ 180,420	$ 36,514

Balance Sheet Components - Accr

Balance Sheet Components - Accrued Expenses and Other (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued expenses	$ 750,288	$ 482,984
Accrued payroll and bonus	495,016	196,900
Excise tax payable	2,159,147	0
Credit card liabilities	226,138	155,407
Income taxes payable	388,584	250
Total accrued expenses and other	$ 4,019,173	$ 835,541	[1]

[1] (1) Derived from audited financial statements.

Leases - Narrative (Details)

Leases - Narrative (Details)	3 Months Ended		9 Months Ended
Leases - Narrative (Details)	Sep. 30, 2024 USD ($) ft²	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) ft²	Sep. 30, 2023 USD ($)
Leases [Abstract]
Area rented (in square feet) \| ft²	17,098		17,098
Term of contract	28 months		28 months
Variable lease, cost \| $	$ 13,668	$ 39,389	$ 54,648	$ 98,917

Leases - Supplemental Informati

Leases - Supplemental Information (Details) - USD ($)	3 Months Ended		9 Months Ended
Leases - Supplemental Information (Details) - USD ($)	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Leases [Abstract]
Operating lease costs during the period	$ 120,228	$ 64,972	$ 309,859	$ 225,971
Cash payments included in the measurement of operating lease liabilities during the period			152,880	167,286
Operating lease liabilities arising from obtaining lease right-of-use assets during the period			$ 1,184,913	$ 0
Weighted-average remaining lease term (in months) as of period-end	27 months	8 months	27 months	8 months
Weighted-average discount rate during the period	8.76%	6.85%	8.76%	6.85%

Leases - Components of Operatin

Leases - Components of Operating Lease Costs (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Lessee, Lease, Description [Line Items]
Total operating lease costs	$ 120,228	$ 64,972	$ 309,859	$ 225,971
Month-to-Month Lease Arrangements
Lessee, Lease, Description [Line Items]
Total operating lease costs	37,339	14,397	123,569	74,247
Research and development
Lessee, Lease, Description [Line Items]
Total operating lease costs	86,804	31,296	228,422	121,875
Sales, general and administrative
Lessee, Lease, Description [Line Items]
Total operating lease costs	$ 33,424	$ 33,676	$ 81,437	$ 104,096

Leases - Maturities Of Operatin

Leases - Maturities Of Operating Lease Liabilities (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023	[1]
Leases [Abstract]
2024 (remaining three months of the year)	$ 135,928
2025	549,188
2026	565,602
Minimum lease payments	1,250,718
Less imputed interest	(113,899)
Operating lease liabilities	466,624	$ 93,935
Operating lease liabilities, net of current portion	670,195	$ 0
Total operating lease liabilities	$ 1,136,819

[1] (1) Derived from audited financial statements.

Financial Instruments - Cash, C

Financial Instruments - Cash, Cash Equivalents, and Marketable Securities by Investment Category (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023	[1]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash	$ 5,309,330
Cash equivalents	86,490,424
Cash and cash equivalents and amortized cost	285,749,517
Unrealized gains	2,721,087
Fair Value	196,670,850
Fair Value	288,470,604
Cash and cash equivalents	91,799,754	$ 9,867,588
Current Marketable Securities	139,590,389	0
Noncurrent Marketable Securities	57,080,461	$ 0
Allowance for credit loss	0
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents and fair value	240,955,022
Unrealized gains	2,146,020
Fair Value	243,101,042
Current Marketable Securities	99,530,157
Noncurrent Marketable Securities	57,080,461
Fair Value, Inputs, Level 1 \| U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized cost	154,464,598
Unrealized gains	2,146,020
Fair Value	156,610,618
Current Marketable Securities	99,530,157
Noncurrent Marketable Securities	57,080,461
Unrealized loss, before tax	0
Fair Value, Inputs, Level 1 \| Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	86,490,424
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized cost	39,485,165
Unrealized gains	575,067
Fair Value	40,060,232
Current Marketable Securities	40,060,232
Fair Value, Inputs, Level 2 \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized cost	34,615,346
Unrealized gains	498,739
Fair Value	35,114,085
Current Marketable Securities	35,114,085
Fair Value, Inputs, Level 2 \| Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized cost	4,869,819
Unrealized gains	76,328
Fair Value	4,946,147
Current Marketable Securities	$ 4,946,147

[1] (1) Derived from audited financial statements.

Financial Instruments - Fair Va

Financial Instruments - Fair Value of Marketable Securities by Contractual Maturities (Details)	Sep. 30, 2024 USD ($)
Investments, Debt and Equity Securities [Abstract]
Due within 1 year	$ 139,590,389
Due after 1 year through 5 years	57,080,461
Fair Value	$ 196,670,850

Financial Instruments - Narrati

Financial Instruments - Narrative (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Cash, cash equivalents, restricted cash, and restricted cash equivalents	$ 91,799,754	$ 9,867,588	$ 10,009,921	$ 9,653,528

Simple Agreements for Future _3

Simple Agreements for Future Equity - Narrative (Details) - USD ($)	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	May 08, 2024	Dec. 31, 2023
Schedule Of Reverse Recapitalization [Line Items]
Proceeds from simple agreements for future equity	$ 10,232,000	$ 12,315,000
Outstanding Principal Balance of SAFE Notes Before Closing	$ 0		$ 42,557,000	$ 32,325,000
SAFE Notes, Excluding Subscriptions
Schedule Of Reverse Recapitalization [Line Items]
Proceeds from simple agreements for future equity		340,000
SAFE Notes, Subscriptions
Schedule Of Reverse Recapitalization [Line Items]
Proceeds from simple agreements for future equity		$ 11,975,000

Simple Agreements for Future _4

Simple Agreements for Future Equity - Schedule of SAFE Note Amendments (Details)	May 09, 2024 $ / shares shares	Sep. 30, 2024 USD ($) shares	May 08, 2024 USD ($) shares	Dec. 31, 2023 USD ($) shares
Reverse Recapitalization [Line Items]
Outstanding principal balance of SAFE Notes \| $		$ 0	$ 42,557,000	$ 32,325,000
Common stock, outstanding (in shares)	122,096,270	122,096,270	1,386,983	69,242,940
Recapitalization exchange ratio	6.062
Stock issued during period, acquisitions (in shares)	8,407,894
Valuation cap of $300,000,000
Reverse Recapitalization [Line Items]
Outstanding principal balance of SAFE Notes \| $			$ 13,994,800
Price (in dollars per share) \| $ / shares	$ 22.445945
Common stock, outstanding (in shares)			623,487
Recapitalization exchange ratio	6.062
Stock issued during period, acquisitions (in shares)	3,779,578
Valuation cap of $500,000,000
Reverse Recapitalization [Line Items]
Outstanding principal balance of SAFE Notes \| $			$ 28,562,200
Price (in dollars per share) \| $ / shares	$ 37.409909
Common stock, outstanding (in shares)			763,496
Recapitalization exchange ratio	6.062
Stock issued during period, acquisitions (in shares)	4,628,316

Fair Value Measurements - Key A

Fair Value Measurements - Key Assumptions (Details)	May 08, 2024	Dec. 31, 2023
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input, term	5 years
Asset volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.830	0.858
Risk-free rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.045	0.038
Expected term
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	60	60

Fair Value Measurements - Recon

Fair Value Measurements - Reconciliation of Liabilities Measured at Fair Value (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2024
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 0	$ 46,042,000
SAFE Notes issued during the period	0	10,232,000
Change in fair value during the period	0	29,919,959
SAFE Notes converted during the period	0	(42,557,000)
Change in fair value upon conversion on SAFE Notes at Closing	0	(43,636,959)
Ending balance	$ 0	$ 0

Fair Value Measures - Narrative

Fair Value Measures - Narrative (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Fair Value, Inputs, Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
SAFE notes, fair value of shares	$ 0	$ 46,042,000

Right of First Refusal Liabil_2

Right of First Refusal Liability (Details)	Sep. 30, 2024 USD ($)	Feb. 16, 2024 USD ($) MWd	Dec. 31, 2023 USD ($)	[1]
Long-Term Purchase Commitment [Line Items]
Commitment period		20 years
Purchase power agreement additional extension term		20 years
Right of first refusal term		36 months
Right of first refusal liability \| $	$ 25,000,000	$ 25,000,000	$ 0
Minimum
Long-Term Purchase Commitment [Line Items]
Powerhouse production capability		100
Maximum
Long-Term Purchase Commitment [Line Items]
Powerhouse production capability		500

[1] (1) Derived from audited financial statements.

Redeemable Convertible Prefer_3

Redeemable Convertible Preferred Stock (Details)	Sep. 30, 2024 shares	Jun. 30, 2024 shares	Dec. 31, 2023 shares	Sep. 30, 2023 shares	Jun. 30, 2023 shares	Dec. 31, 2022 shares	Nov. 05, 2018 shares
Class of Stock [Line Items]
Redeemable convertible preferred stock, shares outstanding (in shares)	0	0	0	0	0	0	6,585,881
Redeemable convertible preferred stock, shares issued (in shares)							6,585,881
Common stock, issued (in shares)	122,096,270		69,242,940				39,923,611
Preferred Stock Series A-1
Class of Stock [Line Items]
Redeemable convertible preferred stock, shares outstanding (in shares)							4,526,703
Redeemable convertible preferred stock, shares issued (in shares)							4,526,703
Original issue price per share (in dollars per share)							6.062
Common stock, issued (in shares)							27,440,874
Preferred Stock Series A-2
Class of Stock [Line Items]
Redeemable convertible preferred stock, shares outstanding (in shares)							55,135
Redeemable convertible preferred stock, shares issued (in shares)							55,135
Original issue price per share (in dollars per share)							6.062
Common stock, issued (in shares)							334,228
Preferred Stock Series A-3
Class of Stock [Line Items]
Redeemable convertible preferred stock, shares outstanding (in shares)							2,004,043
Redeemable convertible preferred stock, shares issued (in shares)							2,004,043
Original issue price per share (in dollars per share)							6.062
Common stock, issued (in shares)							12,148,509

Stockholders' Equity (Details)

Stockholders' Equity (Details)		3 Months Ended		6 Months Ended	9 Months Ended
Stockholders' Equity (Details)	May 09, 2024 vote director $ / shares shares	Sep. 30, 2024 USD ($) $ / shares shares	Sep. 30, 2023 USD ($) shares	Jun. 30, 2024 USD ($) shares	Sep. 30, 2024 USD ($) $ / shares shares	Sep. 30, 2023 USD ($) shares	Dec. 31, 2023 $ / shares shares
Class of Stock [Line Items]
Common stock, authorized (in shares)	501,000,000	500,000,000			500,000,000		500,000,000
Common stock, par value (in dollars per share) \| $ / shares		$ 0.0001			$ 0.0001		$ 0.0001
Common stock, voting rights per share \| vote	1
Exercise of stock options \| $			$ 38,675	$ 439,922
Preferred stock, issued (in shares)		0			0
Preferred stock, outstanding (in shares)		0			0
Preferred Stock
Class of Stock [Line Items]
Common stock, authorized (in shares)	1,000,000
Common stock, par value (in dollars per share) \| $ / shares	$ 0.0001
Common Class A
Class of Stock [Line Items]
Common stock, par value (in dollars per share) \| $ / shares	$ 0.0001
Common stock, conversion ratio (in shares)	1
Common stock, number of directors \| director	7
Reserved for future issuance (in shares)	10,432,749
Exercised (in shares)		0	133,970		1,345,625	0
Exercise of stock options \| $		$ 0	$ 38,675		$ 439,922	$ 0
Common Class A \| Legacy Oklo 2016 Plan
Class of Stock [Line Items]
Reserved for future issuance (in shares)	10,432,749
Common Class A \| The 2024 Plan
Class of Stock [Line Items]
Reserved for future issuance (in shares)	15,872,516
Common Class A \| Employee Stock
Class of Stock [Line Items]
Reserved for future issuance (in shares)	2,441,926
Common Class A \| Common Stock
Class of Stock [Line Items]
Common stock, authorized (in shares)	500,000,000
Exercised (in shares)				1,345,625
Exercise of stock options \| $			$ 13	$ 135

Stock-based Compensation - Narr

Stock-based Compensation - Narrative (Details)	3 Months Ended	9 Months Ended
Stock-based Compensation - Narrative (Details)	Sep. 30, 2024 USD ($) shares	Sep. 30, 2024 USD ($) shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock option, cost not yet recognized \| $	$ 19,727,841	$ 19,727,841
Legacy Oklo 2016 Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Options, outstanding (in shares)	10,432,749	10,432,749
The 2024 Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Award expiration period		10 years
Employee Stock Option
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock option, cost not yet recognized, period for recognition	3 years 8 months 8 days
Employee Stock Option \| Legacy Oklo 2016 Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Award expiration period		10 years
Restricted Stock Units (RSUs)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Non-option equity instruments, outstanding (in shares)	1,351,478	1,351,478
Vested (in shares)		67,416
Nonvested (in shares)	1,284,062	1,284,062
Employee Stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Award expiration period		20 years
Granted (in shares)		0

Stock-based Compensation - Shar

Stock-based Compensation - Share Based Compensation Expense Charged to Operations (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total costs charged to operations	$ 1,626,364	$ 47,403	$ 10,750,780	$ 144,196
Plan modification, incremental cost			7,784,200
Research and development
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total costs charged to operations	398,153	34,056	7,293,541	101,055
General and administrative
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total costs charged to operations	$ 1,228,211	$ 13,347	$ 3,457,239	$ 43,141

Income Taxes (Details)

Income Taxes (Details) - USD ($)	3 Months Ended		9 Months Ended
Income Taxes (Details) - USD ($)	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Effective income tax rate reconciliation, percent	(0.60%)	0%	(0.60%)	0%
Income taxes	$ 224,963	$ 0	$ 388,584	$ 0
Unrecognized tax benefits	$ 0		$ 0		$ 0

Commitments and Contingencies (

Commitments and Contingencies (Details)	Sep. 30, 2024 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Loss contingency accrual	$ 0

Subsequent Events (Details)

Subsequent Events (Details) $ in Millions	Nov. 13, 2024 day shares	Nov. 07, 2024 USD ($)	May 09, 2024 day shares	May 08, 2024 shares
Subsequent Event [Line Items]
Contingent consideration, (in shares) \| shares			15,000,000	78,996,459
Trading day threshold \| day			20
Trading day period \| day			60
Founder Shares
Subsequent Event [Line Items]
Contingent consideration, (in shares) \| shares			1,450,000
Subsequent Event
Subsequent Event [Line Items]
Trigger event, business days \| day	5
Trading day threshold \| day	20
Trading day period \| day	60
Subsequent Event \| Atomic Alchemy Acquisition
Subsequent Event [Line Items]
Price of acquisition, expected \| $		$ 25
Subsequent Event \| Earnout Shares
Subsequent Event [Line Items]
Contingent consideration, (in shares) \| shares	14,700,000
Forfeited (in shares) \| shares	300,000
Subsequent Event \| Founder Shares
Subsequent Event [Line Items]
Released from restrictions (in shares) \| shares	12,500,000