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Claude Fable 5.1 and Mythos 5.1 are Anthropic's first models

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.

Source: PCWorld · Opens in new tab