Three authors—Andrea Bartz, Charles Graeber, and Kirk Wallace Johnson—filed a class action lawsuit in August 2024 in the U.S. District Court for the Northern District of California (Case No. 3:24-cv-05417) . They alleged that Anthropic downloaded hundreds of thousands of copyrighted books (nearly 500,000 works) from pirate sites to train its AI chatbot Claude, violating copyright law . Court documents also state that Anthropic purchased physical books, tore off bindings, scanned them, and stored digitized copies for training .
In June 2025, Judge Alsup issued a key summary judgment ruling: using books acquired legally to train AI was fair use, but he denied Anthropic's motion for summary judgment on works obtained from pirate sites, allowing those infringement claims to proceed to trial . The parties reached a settlement in late August 2025, avoiding a trial scheduled for December 2025 . Judge Alsup gave preliminary approval in September 2025 . Final approval was initially delayed in May 2026 when Judge Martínez-Olguín requested more detail on attorney fees and lead-plaintiff compensation before signing off . After the fee request was reduced, she granted final approval on July 20, 2026 .
The per-work payout decreased significantly as the claims rate surged well above initial estimates.
| Stage | Claims rate (works) | Payout per work |
|---|---|---|
| Initial estimate (March 2026) | ~54% (264,809 of ~482,460 works) | ~$4,876 |
| Final claims rate (May 2026 hearing) | 92.77% (447,576 of ~482,460 works) | Roughly $3,000 |
The initial payout projection of about $4,876 per work was based on a much lower expected claims rate. Because over 92% of eligible works were ultimately claimed, the same $1.5 billion fund was spread across far more works, reducing each payout to approximately $3,000 per work .
The opt-out numbers were remarkably low compared to typical class actions (where claims rates are often around 10%):
Attorney fees were a major flashpoint that delayed final approval:
The final approved fee structure remains $187.5 million (12.5%) for lead counsel, representing a roughly $112.5 million reduction from the original ask .