Bleichroeder Acquisition Corp. I (BACQ) S-1/AIPO registration (amended)

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We hereby consent to the use in the Prospectus constituting a part of this Registration Statement on Amendment No. 2 to Form S-1 of our report dated October 7, 2024, relating to the financial statements of Bleichroeder Acquisition Corp. I, as of June 30, 2024 and for the period from June 24, 2024 (inception) through June 30, 2024, which is contained in that Prospectus. We also consent to the reference to our firm under the caption “Experts” in the Prospectus.

/s/ WithumSmith+Brown, PC

New York, New York

October 7, 2024