Artificial intelligence company Anthropic is facing a class-action lawsuit in California federal court by authors Andrea Bartz, Charles Graeber, and Kirk Wallace Johnson. The plaintiffs allege that Anthropic used pirated versions of their books and hundreds of thousands of others to train its AI chatbot, Claude, without permission. Anthropic, backed by Amazon and Google, is accused of building a multibillion-dollar business through the unauthorized use of copyrighted works compiled in datasets like The Pile and Books3. The lawsuit seeks unspecified monetary damages and an order preventing Anthropic from further misuse of copyrighted materials. This case adds to a growing number of legal challenges against AI companies over the use of copyrighted content for training AI models.