Anthropic to Add Invisible Watermarks to Claude-Generated Text
Anthropic says it will add invisible, machine-readable watermarks to text generated by Claude, Claude Code, Claude Cowork, Claude Tag, and its API, as well as to supported Claude options through AWS, Google Cloud, and Microsoft Foundry.
The company says supported models will embed the marks directly in their text where readers cannot see them, similar to Google's SynthID. It also claims that these watermarks will "stick" to copied text and can survive some editing.
Anthropic ties the policy to Article 50(2) of the European Union's AI Act and its Code of Practice on Transparency of AI-Generated Content. The EU requires that generative AI systems use tools to mark and detect synthetic content when it's feasible. The obligations began on August 2, 2026, although older systems have until December 2026 to meet this requirement.
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Going forward, models launching in the EU will watermark content from their...
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