Sony Music Publishing and Warner Chappell Music, backed by 35 affiliated publishers in total, sued Anthropic and its co-founders Dario Amodei and Benjamin Mann in federal court in Northern California, alleging the company built Claude on torrented and scraped lyrics and sheet music. The suit seeks statutory damages of $150,000 per work plus $25,000 per violation, a formula that plaintiffs and multiple outlets peg at potentially billions of dollars once applied across the tens of thousands of works cited.
What changes here isn’t the legal theory — it’s the leverage. Anthropic already paid $1.5 billion in September 2025 to settle the Bartz book-publisher case, the largest copyright payout in U.S. legal history, and that case established the wedge these new plaintiffs are driving through: training on copyrighted material may be defensible, but acquiring it via piracy is not.
The Bartz settlement was meant to be Anthropic’s ceiling on music-and-books liability; Sony and Warner’s filing treats the $1.5 billion figure instead as proof the floor needs to be higher.
The timing compounds the problem. Anthropic is reportedly discussing an IPO at a valuation as high as $2 trillion, per the Financial Times as cited by the South China Morning Post — and a contingent-liability stack that already includes Universal Music Group, Concord and ABKCO’s $3 billion claim (filed in January 2026, per PCMag and TechCrunch) plus a separate BMG suit now has a third, larger music-industry front. Underwriters and prospectus lawyers will need a number for this, and there isn’t a clean one yet: the range runs from a licensing settlement in the hundreds of millions to, per StartupHub.ai’s framing of the plaintiffs’ request, an injunction that could force Anthropic to retrain or discard Claude models entirely — an outcome with no real precedent in AI litigation.
Watch for whether Anthropic settles quickly to keep this off the IPO roadshow, or lets it run and risks a valuation that has to price in retraining risk rather than just a check. Also watch whether courts start treating the acquisition-method distinction from Bartz as a template other plaintiffs’ firms — the same lawyers appear across several of these suits — can replicate against other labs.
one of the largest and most blatant ongoing thefts of intellectual property in history
— Mashable
