{"name":"fable51","slug":"fable51","family":"setting","title":"Settings keys","noun":"settings key","description":"The gate controlling whether the fable model is added to opus and haiku lists was renamed from fable5 to fable51.","description_source":"entry","described_by":{"version":"2.1.257","anchor":"model-availability-gate-renamedupdated-from-fable5-to-fable"},"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":"2.1.321","anchor":"new-fable52-model-alias","heading":"New fable52 model alias","line":"Claude Code now recognises fable52 as a model alias, next to fable51","released_at":"2026-11-09 19:02:47","reason":"found in this entry's text"},{"version":"2.1.260","anchor":"hidden-fable-model-surfaced-only-after-an-entitlement-prob","heading":"Hidden 'fable' model surfaced only after an entitlement probe accepts","line":"A hidden Fable model only appears once a server-side entitlement probe accepts your account.","released_at":"2026-09-03 22:32:02","reason":"found in this entry's text, named in this entry"},{"version":"2.1.257","anchor":"model-availability-gate-renamedupdated-from-fable5-to-fable","heading":"Model-availability gate renamed\/updated from fable5 to fable51","line":"The gate controlling whether the fable model is added to opus and haiku lists was renamed from fable5 to fable51.","released_at":"2026-09-01 17:15:33","reason":"found in this entry's text, named in this entry"},{"version":"2.1.257","anchor":"new-model-alias-fable51-added","heading":"New model alias fable51 added","line":"A fable51 entry joins the internal model alias list used for resolution and allowlisting.","released_at":"2026-09-01 17:15:33","reason":"named in this entry, found in this entry's text"},{"version":"2.1.257","anchor":"claude-fable-5-1-model-wiring-vertex-region-gate","heading":"claude-fable-5-1 model wiring (Vertex region + gate)","line":"claude-fable-5-1 is wired up with its own Vertex region, and fallback lists now gate on a fable51 check.","released_at":"2026-09-01 17:15:33","reason":"found in this entry's text"}],"entries_total":5,"docs":[],"docs_total":0,"gates":[],"related":[],"url":"https:\/\/changelogs.core-directive.com\/reference\/setting\/fable51","family_url":"https:\/\/changelogs.core-directive.com\/reference\/setting.json"}