Sony Music and Warner Chappell Sue Anthropic in 'Multi-Billion Dollar' Copyright Lawsuit Over AI Training

The lawsuit, first reported by Music Business Worldwide, accuses Anthropic of 'blatant theft' by using copyrighted lyrics and sheet music without permission. The publishers are seeking up to $150,000 per infringed work and an additional $25,000 for each instance where copyright management information was stripped. If the court awards the maximum, total damages could amount to several billion dollars.

This is the latest in a series of copyright challenges facing Anthropic. In July, the company was ordered to pay $1.5 billion to settle a class-action suit from authors who alleged its training data included pirated books. In that case, a judge ruled that while using copyrighted works for training could be legal, acquiring them through piracy was not.

Some of the same lawyers representing the music publishers previously brought a $3 billion suit against Anthropic on behalf of Universal Music Group, Concord, and others in January. The new lawsuit is notably broader, specifically accusing Anthropic of 'flagrant piracy' through illegal torrenting to obtain millions of copies of books containing lyrics and sheet music.

Anthropic could not be reached for comment prior to publication. The suit names co-founders Dario Amodei and Benjamin Mann personally as defendants.

Why This Matters

The lawsuit could set a major precedent for whether training AI models on copyrighted music without a license constitutes infringement, potentially reshaping how AI companies source training data.
The sheer scale of potential damages—billions of dollars—threatens Anthropic's financial stability, especially coming just months after a $1.5 billion settlement with authors.
The personal naming of co-founders signals that publishers are seeking to hold executives individually accountable, which could deter risk-taking in the AI industry.

Background

Anthropic, the AI company behind the Claude chatbot, has faced a growing wave of copyright lawsuits from creators. In addition to the author settlement, it has been sued by multiple music publishers including Universal Music Group, Concord, and ABKCO. The legal theory at the heart of these cases is that while training AI on publicly available copyrighted works may be permissible under fair use, acquiring that data through illegal means—such as torrenting pirated copies—is not. The new suit builds on that argument, alleging a systematic pattern of piracy.

Key Perspectives

Music Publishers (Sony, Warner): They argue Anthropic engaged in one of the largest and most blatant thefts of intellectual property in history, illegally downloading millions of copies of books and musical works to build its AI. They seek billions in damages and an injunction preventing further use of their works. Anthropic: The company has not yet responded to this specific lawsuit. Historically, it has argued that AI training on publicly available data is transformative and not infringing, while also taking steps to settle cases where piracy was proven. Critics and Legal Experts: The case highlights the tension between AI innovation and copyright law. Some argue that the music industry is using litigation to extract rents from AI companies, while others see it as a necessary protection for creators whose work is used without compensation.

What to Watch

Anthropic's formal response and any motion to dismiss, which could clarify its legal defense.
Whether the court consolidates this case with the earlier Universal Music suit, or treats them separately.
The impact on Anthropic's funding and valuation, particularly if the lawsuit proceeds toward trial rather than settlement.

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