Sony Music Publishing / Warner Chappell v. Anthropic, multi-billion dollar AI lyrics torrenting suit

Background

On August 28, 2026, Sony Music Publishing and Warner Chappell Music filed a copyright suit against Anthropic in the US District Court for the Northern District of California. Unusually, the complaint also names two individuals: CEO Dario Amodei and co-founder Benjamin Mann. The publishers are represented by Oppenheim + Zebrak, the firm leading the earlier Concord/UMG case against Anthropic, and by Pryor Cashman.

The theory is built largely on the record from Bartz v. Anthropic, the authors' class action that Anthropic settled for $1.5 billion in September 2025 and in which a judge in the same district described the company's conduct as "straightforward piracy but at massive scale." The publishers allege Mann used BitTorrent to download at least five million pirated books from Library Genesis in June 2021, that employees took at least two million more from Pirate Library Mirror in July 2022, and that those libraries contained lyrics and sheet music for "thousands upon thousands" of their compositions. The complaint quotes internal material unsealed in Bartz, including Mann's description of LibGen as "sketchy AF" and a 2024 planning document reading "We don't want it to be known that we are working on this." It further alleges Anthropic scraped licensed lyric sites including Musixmatch and LyricFind, and that Claude still reproduces lyrics verbatim when guardrails are bypassed by "re-prompting."

The suit brings four counts: direct infringement by torrenting against all three defendants, contributory infringement against Amodei and Mann personally, and direct infringement and removal of copyright management information against Anthropic alone. Statutory damages of up to $150,000 per work and $25,000 per stripped notice, across tens of thousands of works, put the theoretical exposure in the billions. The publishers also demand destruction of infringing copies and an accounting of Claude's training data. The $1.5 billion authors' settlement, the complaint says, was treated by Anthropic as "just the cost of doing business."

Anthropic told reporters the case is "recycling allegations from cases already before the courts" and that it will "defend ourselves robustly," pointing to the Bartz court's holding that training is transformative fair use.

Why It Matters for Artists and Fans

This is the fifth music-publishing action against Anthropic, after Concord/UMG/ABKCO's original 2023 suit and their $3 billion January 2026 follow-on, BMG's March 2026 case, and Round Hill's August 2026 filing. All three majors' publishing arms are now litigating against the same defendant over the same conduct, which makes settlement leverage, and settlement terms, a story about the whole industry rather than one catalog.

For songwriters, the question that matters is the same one this tracker asks about every label enforcement win: if the publishers recover, how much reaches the writers whose lyrics were in the training data? Publishing contracts typically split recoveries, but "settlement" income is not always treated like a royalty, and the AFM's suit against UMG and Warner on this same page is a live example of a creator group arguing it was cut out of an AI licensing deal struck in its name.

Naming Amodei and Mann personally is the other thing to watch. Individual liability for executives is rare in copyright cases against tech companies, and it signals the publishers want the piracy findings from Bartz to attach to people, not just a corporate balance sheet that a $2 trillion valuation can absorb.