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Claude Fable 5.1 watermark: It has a blind spot developers can’t ignore

calendar_today September 1, 2026 person Amanda Caswell domain the-new-stack

Anthropic launched Claude Fable 5.1 on Tuesday with a statistical signature embedded in its generated text, but developers shouldn’t expect The post Claude Fable 5.1 watermark: It has a blind spot developers can’t ignore appeared first on The New Stack .

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