Claude Fable 5.1 and Mythos 5.1 are Anthropic's first models to watermark text outputs; a detection API is available to eligible groups as required under EU law (Ben Patterson/PCWorld)

TechmemeSeptember 1, 2026en

Ben Patterson / PCWorld : Claude Fable 5.1 and Mythos 5.1 are Anthropic's first models to watermark text outputs; a detection API is available to eligible groups as required under EU law — Anthropic has announced the arrival of its latest Claude models, and just as it promised last month, the new models will add invisible watermarks to all their text replies.

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• Anthropic
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