Anthropic · Claude · Google · Anthropic
Claude’s text watermark is a version of the SynthID-Text approach published by Google DeepMind in a Nature paper in 2024
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There are limitations to the effectiveness of watermarking.
Key facts
- Anthropic, along with several other major AI model providers and around 190 total signatories, signed the EU Code of Practice on Transparency of AI-Generated Content in July 2026
- The EU law includes a transition period for Anthropic models launched before August 2, 2026, and they're working to add watermarking for those models as well
- Claude’s text watermark is a version of the SynthID-Text approach published by Google DeepMind in a Nature paper in 2024
- They're implementing watermarking to comply with the EU AI Act
Summary
In this article, they share answers to some of the questions they've received about how their chosen watermarking method works, whether it affects Claude’s outputs, and why they're making this change. The team use a method of watermarking that does not have any practical impact on the quality or content of Claude’s outputs;. The difference between watermarked and un-watermarked text will not be distinguishable to readers;. Nothing is added to the text and there are no hidden characters;. Watermarking doesn’t require extra tokens, and will not be more expensive;.