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Anthropic's Lawyer Apologizes After Claude Hallucinates Legal Citation

Anthropic's Lawyer Apologizes After Claude Hallucinates Legal Citation

June 5, 2025
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Anthropic

In a recent development, a lawyer representing Anthropic acknowledged the use of an incorrect citation generated by the company’s Claude AI chatbot during its ongoing legal dispute with music publishers. The admission came via a court filing in a Northern California courtroom on Thursday.

Anthropic stated in the filing, first reported by Bloomberg, that Claude had fabricated the citation with both an incorrect title and author details. The company's lawyers admitted that their routine citation checks failed to detect the error, along with several other inaccuracies caused by Claude's "hallucinations."

Apologizing for the oversight, Anthropic described the incident as "an honest citation mistake and not a fabrication of authority."

Earlier this week, attorneys for Universal Music Group and other music publishers accused Anthropic’s expert witness, employee Olivia Chen, of referencing fabricated articles in her testimony, allegedly using Claude. Following this, Federal Judge Susan van Keulen requested a response from Anthropic regarding these claims.

The lawsuit brought forth by the music publishers is part of multiple conflicts between copyright holders and tech firms over the alleged misuse of their content to develop generative AI tools.

This marks yet another instance where the use of AI in legal proceedings has led to unintended consequences. Earlier this week, a California judge criticized two law firms for submitting "phony AI-generated research" in his court. In January, an Australian attorney was exposed for utilizing ChatGPT in drafting court documents, resulting in flawed citations.

Despite such incidents, startups continue to attract significant funding to automate legal processes. Harvey, which employs generative AI models to aid lawyers, is reportedly in discussions to secure over $250 million at a valuation exceeding $5 billion.

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Comments (3)
0/500
RalphMitchell
RalphMitchell September 10, 2026 at 8:00:10 AM EDT

Claudeが法廷で出典を間違えたって、さすがにまずいよね😅 AIの過信は危険だわ。弁護士が謝罪したってことは、実害があったってことだよね。技術の進歩は速いけど、信頼性が追いついてないのが現実。もっと慎重に検証する仕組みが必要だと思う。 #Anthropic #AI

JamesGreen
JamesGreen February 6, 2026 at 1:00:42 PM EST

Kann jemand erklären, warum selbst Top-LLMs noch Halluzinationen produzieren? Besonders bei Rechtsthemen ist das echt kritisch. Die Entschuldigung ist ein Schritt, aber wie werden solche Fehler in Zukunft verhindert? 🤔 Bin gespannt, ob sich da bald branchenweite Standards durchsetzen.

FredYoung
FredYoung July 31, 2025 at 10:48:18 PM EDT

Claude messing up legal citations? Yikes, that’s a rough day for Anthropic’s team. Hope they double-check those AI outputs next time! 😅

OR