introducing-claude-fable-5-and-claude-mythos-5 changedabout-claude/models/introducing-claude-fable-5-and-claude-mythos-5
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## Models ## Refusals, fallback, and billing on Claude Fable 5 ### Refusals ### Fallback ### Billing ## Availability ## Working with Claude Fable 5 and Claude Mythos 5 ### 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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