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Anthropic launched two new Claude models today — Fable 5.1 and Mythos 5.1 — and buried inside the pricing news is a number almost no AI lab would voluntarily publish: the exact benchmark gap between the guarded model and its lightly guarded twin. Jet West breaks down the protein-binder science that got overshadowed, the API change that tells you who Anthropic thinks its adversaries are, and what the five-point gap actually means.