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Anthropic Implements Semantic Watermarking System in Claude to Mark AI-Generated Text

Feature update Provisional 85% confidence first seen

Anthropic announced a watermarking system for Claude that embeds subtle markers in generated text over 150 words by biasing word choices toward a proprietary "green list" of semantically equivalent words, detectable only with Anthropic's secret key. The system operates probabilistically and is designed to comply with EU regulations on AI-generated content, with Anthropic claiming internal testing shows no impact on text quality or readability.

Anthropic Claude European Union

Source coverage

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