Anthopic's Law Firm Blames Claude Hallucinations for Errors
- Anthropic's law firm apologized on May 15, 2025, for citation errors in an expert report filed in a Northern California copyright lawsuit involving music publishers.
- The errors arose after using Anthropic's AI tool, Claude, which hallucinated an inaccurate article title and incorrect authors in the legal citation despite the article itself existing.
- Attorney Ivana Dukanovic of Latham & Watkins stated the mistake was an honest citation error not caught by manual checks and emphasized the article supports expert Olivia Chen's testimony on margin-of-error standards.
- The court instructed Anthropic to submit a statement explaining the issue by May 15, while a lawyer representing Anthropic described the error as a regrettable and inadvertent citation mistake caused by Claude’s hallucinations.
- This case highlights judicial concern over AI hallucinations in legal filings and suggests growing pressure on lawyers to verify AI-generated content to avoid disciplinary action.
25 Articles
25 Articles
Lawyer for Anthropic Apologizes for Fake Legal Citation Generated by His Client's Own Claude AI
A lawyer representing AI company Anthropic admitted to including an inaccurate citation generated by the company's Claude chatbot in an ongoing legal dispute with music publishers.


Anthropic's Claude faked a legal citation. A lawyer had to clean it up.
In a copyright lawsuit over Anthropic's use of music lyrics, the company's legal team used its AI assistant, Claude, to help draft a citation in an expert report.illustration by Cheng Xin/Getty ImagesClaude generated "an inaccurate title and incorrect authors" in a legal citation, per a court filing.The AI was used to help draft a citation in an expert report for Anthropic's copyright lawsuit.Anthropic's lawyer called it "an embarrassing and uni…
Seemingly Nonexistent Citation in Anthropic Expert's Declaration [UPDATE: Apparently Caused by Lawyer's Misuse of Claude to Format Citations]
The Declaration filed by a "Data Scientist at Anthropic" in Concord Music Group, Inc. v. Anthropic PBC includes this citation: But the cited article doesn't seem to exist at that citation or at that URL, and Google found no other references to any article by that title. Bloomberg (Annelise Levy) has a story about this, under the title "Anthropic Expert Accused of Citing Fake Article in AI Lawsuit" (Chat GPT Is Eating the World links to that). Ma…
Anthropic is forced to apologize after Claude undercuts its legal team
Anthropic has admitted in an ongoing copyright lawsuit that its own chatbot, Claude, fabricated a source that was later used as evidence in court. The article Anthropic is forced to apologize after Claude undercuts its legal team appeared first on THE DECODER.
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