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Anthropic extends Claude text watermark to 4 more models with a parameter loophole on two

📅 October 31, 2026 • The Decoder Anthropic is extending its text watermarking system to four additional Claude models: Claude Mythos 5, Claude Opus 4.7, Claude Opus 4.6 and Claude Sonnet 4.6. Newer models in the family, such as Claude Opus 5.5, already carry the feature. The company describes the…

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  1. 2026-10-31 20:10 · DEV Community — AI
    Anthropic extends Claude text watermark to 4 more models with a parameter loophole on two

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