Sullivan & Cromwell has apologized to Chief Judge Martin Glenn after a court filing contained AI-generated errors, including inaccurate citations and other mistakes. The filing was submitted on April 9, 2026, and the apology letter was sent on April 18 in the Prince Global Holdings Chapter 15 case in the US Bankruptcy Court for the Southern District of New York.
In the letter, Andrew Dietderich, co-head of the firm’s global restructuring team, said the firm found that the motion included inaccurate citations and other errors. He also wrote that those errors were later listed and corrected in Schedule A attached to the letter. Reuters reported the filing contained about 40 incorrect citations and other errors tied to AI hallucinations.
Dietderich took responsibility for the failed review. He wrote,
“We deeply regret that this has occurred.”
He also said,
“The Firm and I are keenly aware of our responsibility to ensure the accuracy of all submissions,” adding that he took responsibility for the failure.
Sullivan & Cromwell AI citation errors expose a break in review process
Dietderich said Sullivan & Cromwell already had internal policies for the use of AI tools. Those policies included checking citations before filing. However, he said those procedures were not followed in this instance. As a result, the mistakes made it into a live court submission.
In the same letter, he wrote, “Regrettably, this review process did not identify the inaccurate citations generated by AI, nor did it identify other errors that appear to have resulted in whole or in part from manual error.” That wording matters because it shows the firm linked the filing problems to both AI output and human review failures.
The letter also said the issue came to the firm’s attention after Boies Schiller Flexner flagged the problems. Dietderich wrote that he personally called the rival law firm to thank them for raising the matter and to apologize directly. The corrected filing has since been submitted, according to reporting on the case.
AI hallucinations in legal filings keep growing as courts record more cases
This case adds to a growing list of AI-related filing problems in courts. Legal technologist Damien Charlotin says his database had recorded 1,334 AI hallucination cases worldwide as of April 21, 2026. Of those, 903 were in the United States. The database says the most common issue is fabricated case law, though it also tracks false quotes and misrepresented authorities.
Charlotin’s database includes the Prince Global Holdings matter and notes that the firm acknowledged AI-generated inaccuracies in the April 9 motion. It says the filing included fabricated and misquoted case citations and that the firm later apologized, corrected the errors, and filed revised papers.
The incident also draws attention because Sullivan & Cromwell is one of the largest law firms in the United States by revenue. Public rankings place the firm 30th on the Global 200, and the firm has also worked on major crypto-related matters, including the FTX bankruptcy. That background gives the filing error added weight, since the case involves a firm known for high-stakes court and restructuring work.
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Tatevik Avetisyan is an editor at Kriptoworld who covers emerging crypto trends, blockchain innovation, and altcoin developments. She is passionate about breaking down complex stories for a global audience and making digital finance more accessible.
📅 Published: April 22, 2026 • 🕓 Last updated: April 22, 2026
