Antitrust

Lawsuit alleges Anthropic’s Claude AI language models compromise authors’ ability to earn a living via improper and unauthorized ingestion and use of their books

On July 17, 2025, Lieff Cabraser Heimann & Bernstein, LLP and Susman Godfrey LLP were appointed by the federal courtto serve as Co-Lead Class Counsel in the class action lawsuit against AI company Anthropic PBC for large-scale copyright infringement. The Class’ case is headed to trial in December.

AI-company Anthropic’s Claude models are available for use on a variety of operating systems and also via an application programming interface, which allows developers to build custom generative AI tools using Claude as the base. Claude has been commercially successful, but as Plaintiffs allege, this success is at the expense of working writers.

The Complaint (click to read a copy) alleges that Anthropic’s large language models were built using troves of pirated books that Anthropic “fed” to the Claude models, including works authored by Named Plaintiffs Andrea Bartz, Charles Graeber, and Kirk Wallace Johnson. According to Plaintiffs, Anthropic could not have built a model capable of generating complex text outputs without its exploitation of class members’ works.

As the Complaint summarizes, “Anthropic did what any teenager could tell you is illegal. It intentionally downloaded known pirated copies of books from the internet, made unlicensed copies of them, and then used those unlicensed copies to digest and analyze the copyrighted expression-all for its own commercial gain.”

The lawsuit seeks to give authors what they are owed: consent and compensation. Plaintiffs seek damages from Anthropic for the large-scale infringement of copyrighted works, as well as injunctive relief to prevent such improper conduct from ongoing and recurring.