When Claude Hallucinates in Court: The Latham & Watkins Incident and What It Means for Attorney Liability

MarkTechPost / 5/6/2026

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Key Points

  • A 2025 court filing by Latham & Watkins in Concord Music Group v. Anthropic included material tied to Claude and raised concerns after the system produced hallucinatory (incorrect or fabricated) content in a legal context.
  • The incident highlights a growing question of how attorney liability may attach when AI-generated or AI-assisted statements are presented to a court.
  • It underscores the need for rigorous verification and review processes for any AI outputs incorporated into legal declarations, submissions, or evidence.
  • The case signals that future litigation may increasingly scrutinize not only what the AI said, but also what lawyers did to validate it before filing.
  • Overall, the event is framed as a practical warning for law firms adopting AI tools: compliance and duty-of-care obligations will likely extend to AI-related workflows.

There is a particular kind of irony that the legal profession rarely gets to witness in such pristine form. In May 2025, Latham & Watkins a firm that routinely bills over $2,000 an hour for its partners and counts Anthropic among its clients filed a court declaration in Concord Music Group v. Anthropic that contained […]

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