Full Breakdown
Anthropic Faces New Copyright Lawsuit Over Music Training
9/1/2026, 8:25:56 PM
Anthropic Sued Over Alleged Unauthorized Use of Songs
Sony Music Publishing and Warner Chappell filed a federal lawsuit on August 28 accusing Anthropic, the startup behind Claude, of harvesting “tens of thousands” of copyrighted musical works to train its AI models. The complaint says founders Dario Amodei and Benjamin Mann downloaded lyrics and sheet music from pirate sites and licensed services, incorporated the material into Claude’s training data, and that the model can reproduce copyrighted lyrics verbatim.
Background & Context
The suit follows earlier actions against Anthropic. In October 2023 the company was sued over roughly 500 songs, and a January 2024 suit covered more than 20,000 works seeking over $3 billion in damages. Anthropic settled a separate authors’ case in September 2025 for $1.5 billion, but the publishers argue that settlement does not preclude further infringement.
Key Figures & Groups
- Anthropic – developer of the Claude family of large language models.
- Dario Amodei – CEO and individual defendant.
- Benjamin Mann – Co-founder and individual defendant.
- Sony Music Publishing – Plaintiff.
- Warner Chappell Music – Plaintiff.
- Judge William Alsup – Federal judge whose June 2025 ruling in *Bartz v. Anthropic* was cited by Anthropic as supporting a fair-use defense.
Data & Statistics
- The complaint references “tens of thousands” of musical compositions allegedly copied.
- Sony and Warner seek statutory damages of up to $150,000 per infringed song and up to $25,000 for each removal or alteration of copyright-management information.
- If the upper limits apply, potential liability could reach into the billions of dollars.
- The lawsuit notes Anthropic’s valuation is targeted at $2 trillion, underscoring the financial stakes.
Official Statements & Responses
Anthropic’s spokesperson rejected the allegations, stating the company will “defend ourselves robustly in court.” The firm reiterated its view that training generative AI models constitutes “transformative fair use,” citing the *Bartz* decision as precedent. Anthropic has not disclosed any change to its data-collection practices.
Verbatim Quotes
- “We disagree with the publishers’ claims and we intend to defend ourselves robustly in court.” — Anthropic spokesperson
- “In short, the purpose and character of using copyrighted works to train LLMs to generate new text was quintessentially transformative,” — Judge William Alsup
Conflicting Reports & Gaps
The complaint does not specify an exact count of songs, describing the scope as “tens of thousands.” No independent audit of Anthropic’s training data has been presented, leaving the precise magnitude of alleged infringement unverified. While the lawsuit alleges that Claude can reproduce lyrics verbatim, Anthropic has not provided technical evidence confirming or refuting this capability.
