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migration-guidemodels/fable-5-2/migration-guide
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9 Nov 2026
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## Migrating to Claude Fable 5.2 from Claude Fable 5.1
### Update your model name
### Breaking changes
### Behavior changes
### Migration checklist
## Migrating to Claude Mythos 5.2 from Claude Mythos 5.1
## Migrating to Claude Fable 5.2 from Claude Opus 5.5
### What changes
## Migrating to Claude Fable 5.2 from Claude Fable 5
### Other changes
## Migrating to Claude Mythos 5.2 from Claude Mythos 5
## Migrating to Claude Fable 5.2 from Claude Opus 5
