Concord v. Anthropic
N.D. California · May 23, 2025
- Jurisdiction
- federal
- Court
- N.D. California
- Record ID
- concord-v-anthropic-2025-05-23
- Observed outcome
- Part of brief was struck; court took it into account as a matter of expert credibility
- Known monetary consequence
- Not recorded
Why this matter warrants attention
An expert declaration submitted for Anthropic in the music-publisher copyright litigation included a footnote generated with Claude.ai that misidentified a real academic source by fabricating its title and authors. Anthropic acknowledged the uncaught error after the publishers raised it at the preliminary-injunction stage. Magistrate Judge Susan van Keulen struck the affected declaration paragraph and footnote, treating the citation error as a serious credibility issue but imposing no monetary sanction. The incident concerned an expert submission, not a party's legal brief. The cited decision identifies the court, parties, date, and disposition stated here.…
The court narrowed the evidentiary record by striking material whose citation error undermined written-submission reliability.
It extends verification accountability beyond lawyer briefs to expert declarations and AI-assisted citation formatting.
Failure modes and consequences
- Trial
- Struck Filing
- AI attribution
- Reported
- Recorded tool
- Claude.ai
- Known monetary consequence
- Not recorded
- Procedural posture
- Part of brief was struck; court took it into account as a matter of expert credibility
reason.com
Secondary or other linked source. The recorded link is not classified as an official court source or docket mirror.
Open underlying sourceA recorded source link is not a substitute for checking the underlying order, filing, opinion, or disciplinary record.
What this record does—and does not—establish
Claude.ai is recorded in the source dataset; confirm the basis in the linked document.
The docket is primary; detailed Claude attribution and partial-strike facts are corroborated by reliable legal reporting.
Latest evidence review: Secondary Source Only (medium confidence).
Controls suggested by the public record
- Cite-check expert declarations like briefs.
- Verify authors, titles, and links.
- Maintain a documented review step for AI formatting.