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The DecoderAugust 14, 2026· 1 min read

Anthropic announces watermark detection API that will let third parties detect Claude's AI texts

Anthropic is releasing a new API to help third parties identify AI-generated text from its language model Claude. The API uses a watermark detection method to verify the text's origin.

What happened

Anthropic has developed a watermark detection API based on Google's SynthID method. This API allows third parties to check if text was written by Claude, but it has limitations with fact-heavy content, code, and heavily rewritten text. The method tweaks the randomness of word selection without affecting the text's quality.

Why it matters

As AI-generated content becomes more prevalent, businesses and individuals need to be able to verify its origin. This API can help you identify whether text was written by Claude, which is useful for content creators, fact-checkers, and anyone who needs to ensure the authenticity of text.

The takeaway

This API can help you verify the authenticity of text generated by Claude, but it's not foolproof and has limitations. You should consider this when using or relying on AI-generated content.

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