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Anthropic launches Claude Fable 5.1 and Mythos 5.1

This story is from 2026-09-01. It is preserved in the archive; the latest stories are on the live feed.

Claude Fable 5.1 pairs lower cache-read costs with new coding and research gains, while Mythos remains restricted to vetted users.

Read the full story at TestingCatalog AI News ↗

Timeline · 2 reports

  1. 2026-09-02 07:46 · Latent Space
    [AINews] Claude Fable/Mythos 5.1: new SOTA model, 75% cache price cut but 70% more output tokens
  2. 2026-09-01 23:59 · TestingCatalog AI News
    Anthropic launches Claude Fable 5.1 and Mythos 5.1

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