United States of America

Bartz et al. v. Anthropic PBC

United States of America
Ongoing settlement
United States District Court N. D. California
23 June 2025
Copyright infringement
AI Model Training; Large Language Models (LLMs); Foundation Models; Generative AI (output); Text‑Generation Systems; Prompt‑Based Generation; General‑Purpose AI Models; Model Pretraining

Case Overview

Anthropic is a large AI research company that develops a range of large language models (LLMs), including the widely-used tool, Claude. Plaintiffs allege that Anthropic downloaded and retained millions of pirated books to train and develop its Claude AI models. Plaintiffs brought this class action under the Copyright Act of 1976. The case questions whether Anthropic's use of copyrighted books was protected by the fair use doctrine.

Authors