Sony Music Publishing and Warner Chappell Music have filed a major lawsuit against AI lab Anthropic and its co-founders, alleging the company engaged in a "brazen campaign of illegally torrenting, scraping, and downloading copyrighted works" to train its Claude AI model. The complaint, filed August 28 in the U.S. District Court for the Northern District of California and first reported by TechCrunch, marks a significant escalation in the music industry's legal battle over generative AI.
The publishers describe the alleged infringement as "one of the largest and most blatant ongoing thefts of intellectual property in history." The lawsuit names Anthropic CEO Dario Amodei and co-founder Benjamin Mann as individual defendants alongside the company. Sony and Warner seek a jury trial and are pursuing statutory damages, the destruction of infringing copies, and access to Anthropic's training data.
The complaint specifically cites the unauthorized use of tens of thousands of musical compositions, naming hit songs like "Ain't No Mountain High Enough," "All I Want for Christmas Is You," "Eye of the Tiger," and "Livin' on a Prayer" as examples of the copyrighted works allegedly copied to train and operate Claude. The publishers accuse Anthropic of systematic infringement through torrenting, scraping, and downloading.
Anthropic has pushed back against the claims. "We disagree with the publishers’ claims and we intend to defend ourselves robustly in court," an Anthropic spokesperson wrote in an emailed statement to TechCrunch.
This new lawsuit means the publishing arms of all three major music companies are now actively litigating against Anthropic. Universal Music Publishing Group, Concord Music Group, and ABKCO initiated the first wave of litigation in October 2023, filing a case in Nashville over approximately 500 songs, which was later transferred to California. Those same publishers filed a second, much larger suit in January 2026, covering more than 20,000 works and seeking over $3 billion in damages.
BMG added a third case in March 2026, targeting 493 compositions. The latest action from Sony and Warner consolidates the industry's offensive, bringing two of the three major publishing powerhouses together in a single coordinated complaint. Some of the lawyers behind this new lawsuit also represent plaintiffs in the earlier cases against Anthropic, indicating a coordinated legal strategy.
The core dispute revolves around the foundational practice of AI model training. Companies like Anthropic ingest massive datasets—often scraped from the public internet—to teach their models to generate text, code, and other content. Rights holders argue this constitutes large-scale copyright infringement when done without permission or compensation. AI companies, meanwhile, have often relied on fair use arguments, contending that the training process is transformative and that the outputs are new creations.
This lawsuit is part of a broader, industry-wide confrontation between creative sectors and AI developers. The music industry, in particular, has been aggressive in defending its catalogues, seeing the unlicensed use of songs to train models that can then generate music or lyrics as an existential threat. The cases against Anthropic are among the most significant and financially substantial, given the multi-billion dollar damages sought in prior related suits.
The legal outcome of these cases could set critical precedents for the entire generative AI field, defining the boundaries of fair use in the age of large language models and establishing what obligations AI companies have to rights holders. A ruling against Anthropic could force a fundamental restructuring of how AI datasets are assembled, potentially requiring licensing agreements and significantly increasing operational costs. A ruling in favor of Anthropic would bolster the AI industry's current data-sourcing practices but likely provoke further legislative action from content industries.
With the lawsuit freshly filed, the next steps will involve Anthropic's formal response to the court and the beginning of what promises to be a lengthy and closely watched discovery process, where the publishers will seek to examine Anthropic's training data and methodologies.
