AI Signal 509
Claude will embed undetectable watermarks in generated text to meet EU AI Act requirements
Developers will receive Claude outputs that carry an undetectable watermark detectable only with a secret key, without any perceptible change in quality, creativity, or cost.
The watermark helps Claude comply with the EU AI Act, which requires AI providers to mark AI-generated content serving the EU market. It allows anyone with the key to assess the likelihood that text came from Claude while remaining invisible to readers. Since the method adds no tokens or cost and does not affect output quality, adoption imposes minimal engineering overhead.
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Watermarking alters the source of randomness for low-stakes token choices using a key and preceding words, without changing the candidate set or adding tokens.
Watermarked text is indistinguishable to readers and shows no measurable impact on quality, creativity, or readability in internal and external tests.
The watermark carries no identifying information, cannot be traced to a person or chat, and is not unique to Claude, other providers will implement similar marks under the same EU rule.
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