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Incident 1558: Sullivan & Cromwell Reportedly Filed Emergency Bankruptcy Motion Containing AI-Generated Legal Errors

Description: Sullivan & Cromwell reportedly filed an emergency motion in the Chapter 15 bankruptcy case of Prince Global Holdings that contained numerous citation and legal inaccuracies. The firm later acknowledged that some errors were AI hallucinations and that its AI-use and citation-review policies had not been followed. After opposing counsel identified the problems, the firm reportedly undertook a formal remedial response.
Editor Notes: https://websitedc.s3.amazonaws.com/documents/In_re_Prince_USA_18_April_2026.pdf

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Alleged: Generative AI developers developed an AI system deployed by Sullivan & Cromwell LLP , Andrew G. Dietderich , Law firms and Lawyers, which harmed United States Bankruptcy Court for the Southern District of New York , Boies Schiller Flexner LLP , Clients of lawyers , Insolvency practitioners , Court-appointed liquidators and Parties in In re Prince Global Holdings Limited.
Alleged implicated AI systems: Sullivan & Cromwell AI-assisted legal drafting workflow , AI-assisted legal drafting systems and Generative AI systems

Incident Stats

Incident ID
1558
Report Count
1
Incident Date
2026-04-09
Editors
Daniel Atherton

Incident Reports

Reports Timeline

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

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

reuters.com

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Sullivan & Cromwell law firm apologizes for AI 'hallucinations' in court filing
reuters.com · 2026

April 21 (Reuters) - Sullivan & Cromwell, a premier Wall Street law firm, apologized to a federal ‌judge for submitting a court filing with inaccurate citations and other errors generated by artificial intelligence.

In a letter dated April …

Variants

A "variant" is an AI incident similar to a known case—it has the same causes, harms, and AI system. Instead of listing it separately, we group it under the first reported incident. Unlike other incidents, variants do not need to have been reported outside the AIID. Learn more from the research paper.
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