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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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introducing-claude-fable-5-and-claude-mythos-5 changedmodels/fable-5/introducing-claude-fable-5-and-claude-mythos-5

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First seen 24 Aug 2026 this site's first read of the page
Recorded edits9to this page, all time

## Models ## Refusals, fallback, and billing on Claude Fable 5 ### Refusals ### Fallback ### Billing ## Availability ## Prompting ## Messages API on Claude Fable 5 and Claude Mythos 5 ### Adaptive thinking is always on ### Raw thinking content is never returned ## Supported features ## Migrating from earlier models ## Next steps

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