{"name":"tengu_fable5_to_fable_alias_migration","slug":"tengu-fable5-to-fable-alias-migration","family":"flag","title":"Feature flags","noun":"feature flag","description":"If your model setting says claude-fable-5, startup rewrites it to the fable alias automatically.","description_source":"entry","described_by":{"version":"2.1.257","anchor":"automatic-migration-of-claude-fable-5-model-alias-to-fabl"},"presence":{"first_seen":null,"removed_in":null,"in_current_build":false,"newest_mined":"2.1.322","builds":0,"mined_builds":161,"first_cited":null},"aliases":[],"entries":[{"version":"2.1.257","anchor":"automatic-migration-of-claude-fable-5-model-alias-to-fabl","heading":"Automatic migration of claude-fable-5 model alias to fable","line":"If your model setting says claude-fable-5, startup rewrites it to the fable alias automatically.","released_at":"2026-09-01 17:15:33","reason":"gate cited by this entry, found in this entry's text"}],"entries_total":1,"docs":[],"docs_total":0,"gates":[],"related":[{"name":"tengu_fable5_launch_shown","slug":"tengu-fable5-launch-shown","description":"An analytics event, not a feature flag. Claude Code logs it, with no fields, from a mount effect keyed `fable5-launch` in the Fable 5 launch announcement, which either introduces Fable 5 (`Fable 5 is here!`) or, once the promo period is over, says `Fable 5 now runs on usage credits.`"}],"url":"https:\/\/changelogs.core-directive.com\/reference\/flag\/tengu-fable5-to-fable-alias-migration","family_url":"https:\/\/changelogs.core-directive.com\/reference\/flag.json"}