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A.I. ‘Hallucinations’ Created Errors in Court Filing, Top Law Firm Say...

Sullivan & Cromwell apologized for submitting a court document that had fake citations created by artificial intelligence. An elite Wall Street law firm has apologized to a federal judge for...

NYTIMES 입력 2026.04.22 07:40 0

A.I. ‘Hallucinations’ Created Errors in Court Filing, Top Law Firm Say...

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A.I. ‘Hallucinations’ Created Errors in Court Filing, Top Law Firm Says

Sullivan & Cromwell apologized for submitting a court document that had fake citations created by artificial intelligence.

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Lawyers for Sullivan & Cromwell apologized for submitting a court filing that had fake citations created by artificial intelligence.

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John Taggart for The New York Times

Santul Nerkar

April 21, 2026,

6:39 p.m. ET

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An elite Wall Street law firm has apologized to a federal judge for submitting a court filing replete with errors created by artificial intelligence, including “hallucinations” that fabricated case citations.

The A.I.-generated errors came in a recent motion in U.S. Bankruptcy Court in Manhattan and were discovered by lawyers from an opposing firm, Andrew Dietderich, a partner at Sullivan & Cromwell, wrote in a letter to Judge Martin Glenn on April 18.

“We deeply regret that this has occurred,” Mr. Dietderich wrote.

The firm provided a ledger of the errors, which spanned three pages and totaled around three dozen. A number of them involved the citation of seemingly imagined passages from real cases.

Sullivan & Cromwell is one of the oldest and most prestigious law firms in the country. It is representing President Trump in several appeals, including his criminal conviction in 2024 in a case that stemmed from a

hush-money payment to a porn star

. Jay Clayton, now the U.S. attorney for the Southern District of New York, was of counsel and formerly a partner at the firm.

The apology revealed the latest embarrassing blunder for lawyers found to have used A.I. in crafting erroneous arguments. The legal profession is undergoing a reckoning over the growing and widespread use of A.I., which is luring lawyers dealing with voluminous research even as it has a propensity to spit out legal falsehoods.

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