Or, for Claude Mythos 5.1, which offers the same capabilities to verified organizations: changedmodels/fable-5-1/migration-guide
Nearest release: v2.1.321, published under an hour before this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
## Migrating to Claude Fable 5.1 from Claude Fable 5 ### Update your model name ### Breaking changes ### Behavior changes ### Recommended changes ### Migration checklist ## Migrating to Claude Fable 5.1 from Claude Opus 5 ### Update your model name ### What changed ### Migration checklist ## Migrating to Claude Fable 5.1 from Claude Opus 4.8 or earlier ### Update your model name ### Migration checklist ## Migrating to Claude Mythos 5.1 from Claude Mythos 5 ### Update your model name ### Migration checklist
The whole hunk
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