Anthropic plans watermarking to flag AI-written text
Anthropic has described a text-watermarking system for future Claude models that embeds a statistical pattern in word choices to allow detectors to estimate whether Claude wrote or edited a passage. The system will not add tokens, will not include user identifiers, and is based on a SynthID-Text style approach that alters token selection randomness without visible changes. Anthropic plans a global rollout and a detection API to meet EU AI Act transparency obligations, and it will use cryptographically signed C2PA credentials for supported image file metadata.
Anthropic will watermark Claude text to indicate AI involvement
Context
The EU AI Act introduced marking obligations that took effect on August 2, 2026.…
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