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Anthropic releases Claude Fable 5.1 and Mythos 5.1

Sep 1, 2026. Covered by 22 outlets.

Anthropic releases Claude Fable 5.1 and restricted Mythos 5.1

Read the original at x.comOpens the publisher's site in a new tab

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Claude Fable 5.1 / Mythos 5.1 announcementx.com, Sep 2

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