Anthropic rolls out Claude Fable 5.1 and Mythos 5.1 with improved performance and safeguards

Anthropic has introduced Claude Fable 5.1 and Claude Mythos 5.1, based on the same underlying model with different safeguard levels. Fable 5.1 is for general use, while Mythos 5.1 is aimed at vetted cybersecurity and life sciences users.

Source: FoneArena2 September 2026 at 8:49 am ISTrss

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Original headline: Anthropic rolls out Claude Fable 5.1 and Mythos 5.1 with improved performance and safeguards
Product category: mobiles
Curation state: curated