Sullivan & Cromwell law firm apologizes for AI 'hallucinations' in court filing

• Andrew Dietderich, co-head of Sullivan & Cromwell's global restructuring group, apologized to U.S. Bankruptcy Court Chief Judge Martin Glenn and thanked Boies Schiller Flexner for identifying the errors
• The firm admitted its 'comprehensive policies and training requirements' for AI tools were not followed, and secondary review processes failed to catch the inaccurate AI-generated citations
• U.S. judges have sanctioned lawyers in dozens of cases for using AI without proper vetting, though AI use is not prohibited if attorneys ensure accuracy of submissions

SUMMARY

Sullivan & Cromwell, a prestigious Wall Street law firm with over 900 lawyers, issued a formal apology to a federal judge on April 18 for submitting a court filing containing inaccurate citations and errors generated by artificial intelligence. The mistakes, described as AI "hallucinations," included fabricated case citations, misquoted laws, and non-existent legal sources.

Key Details:

The errors were discovered by rival law firm Boies Schiller Flexner and occurred in a bankruptcy case related to Prince Global Holdings Limited, a Cambodian conglomerate, before U.S. Bankruptcy Court Chief Judge Martin Glenn in Manhattan. Andrew Dietderich, co-head of Sullivan & Cromwell's global restructuring group, acknowledged the firm's AI policies and training requirements were not followed, and a secondary review process failed to catch the inaccuracies. A corrected version was subsequently filed.

Market Implications:

This incident highlights growing risks associated with AI adoption in professional services, particularly legal work. While U.S. judges have sanctioned lawyers in dozens of similar cases, attorneys remain legally and ethically obligated to verify AI-generated content accuracy despite not being prohibited from using such tools.

The case underscores reputational risks even for elite firms known for mergers and acquisitions, corporate governance, and private equity work. As AI tools become increasingly integrated into legal research and drafting, firms face heightened liability for quality control failures.

Context:

Prince Global Holdings' founder Chen Zhi faces criminal charges in Brooklyn federal court for allegedly directing forced labor operations and investment fraud, though Prince Group has denied the allegations. The bankruptcy proceedings involve foreign representatives managing the conglomerate's wind-down, with Boies Schiller representing objecting debtors.