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Claude Fable 5.1 & Mythos 5.1 Announcement

Anthropic's announcement of Fable 5.1 and Mythos 5.1 — one base model, two guardrail postures.

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Anthropic's announcement of the Fable 5.1 and Mythos 5.1 models: Fable 5.1 targets coding and knowledge work (API id claude-fable-5-1, $10/M input, $50/M output, cache reads cut 75% to $0.25/M), while Mythos 5.1 is the same base model with relaxed guardrails, gated to the Cyber and Life Sciences Verification Programs (US organizations). Terminal-Bench 4.0 at 60.9% (Mythos), HLE 65.0% with tools.

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