{"version":"2.1.257","anchor":"automatic-migration-of-claude-fable-5-model-alias-to-fabl","canonical_anchor":"automatic-migration-of-claude-fable-5-model-alias-to-fabl","heading":"Automatic migration of claude-fable-5 model alias to fable","tier":"notice","area":"Models","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.257\/e\/automatic-migration-of-claude-fable-5-model-alias-to-fabl","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.257","markdown":"### Automatic migration of `claude-fable-5` model alias to `fable`\n\nIf your model setting says claude-fable-5, startup rewrites it to the fable alias automatically.\n\nOn startup, Claude Code now checks whether `userSettings.model` is set to `claude-fable-5` or `claude-fable-5[1m]` and automatically rewrites it to `fable` or `fable[1m]`. The migration fires telemetry `tengu_fable5_to_fable_alias_migration` and increments a dedicated failure counter if the rewrite doesn't complete.\n\n- Area: Models\n- Names: `claude-fable-5`, `fable`\n- Tier: You'll notice\n- Useful: 3\/5\n- Signal: 4\/5"}