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Sullivan & Cromwell Law Firm Apologizes for AI 'Hallucinations' in Court Filing

The firm said its AI policies were not followed and that a review found about 40 corrections across the filing, court papers and declarations.

  • On Saturday, Sullivan & Cromwell partner Andrew Dietderich apologized to Chief Bankruptcy Judge Martin Glenn for submitting a bankruptcy motion for Prince Global Holdings containing AI-generated "hallucinations."
  • Dietderich admitted the firm's policies were "not followed" in preparing the motion after lawyers from Boies Schiller Flexner, representing creditors, discovered errors requiring roughly 40 corrections.
  • Despite mandatory training instructing lawyers to "trust nothing and verify everything," internal review processes failed to catch the fabrications at the 140-year-old firm with more than 1,000 attorneys.
  • Dietderich stated he is "keenly aware of our responsibility to ensure the accuracy of all submissions" and took responsibility for the failure, while confirming no further AI errors in other filings.
  • Legal experts note that AI "hallucinations" pose growing risks for the profession as firms integrate AI tools into research, prompting the American Bar Association to instruct lawyers to exercise caution.
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Sullivan & Cromwell law firm apologizes for AI 'hallucinations' in court filing

·United Kingdom
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Reuters broke the news in United Kingdom on Tuesday, April 21, 2026.
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