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Claude Fable 5.1: 75% Cheaper Cache, Three Things It Breaks

This story is from 2026-09-05. It is preserved in the archive; the latest stories are on the live feed.

Originally published on AI Tech Connect . What changed Two models, one day. Claude Fable 5.1 (claude-fable-5-1) and Claude Mythos 5.1 (claude-mythos-5-1) shipped on 1 September 2026. Mythos 5.1 is the same set of capabilities, restricted to Project Glasswing participants. One price moved. Cache rea…

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  1. 2026-09-05 05:31 · DEV Community — Machine Learning
    Claude Fable 5.1: 75% Cheaper Cache, Three Things It Breaks

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