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Claude Fable 5.1 and Mythos 5.1: The System Card

Don't Worry About the Vase
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Anthropic released Claude Fable 5.1 and Mythos 5.1, advanced AI models with improved safety, alignment, and capabilities. Fable 5.1 is seen as a leading model for frontier intelligence tasks, with ongoing comparisons to GPT-6-Astra. The models include detailed system cards covering risk, safeguards, alignment, and honesty assessments.

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