{"name":"ANTHROPIC_DEFAULT_FABLE_MODEL","slug":"anthropic-default-fable-model","family":"env","title":"Environment variables","noun":"environment variable","description":"Model ID that the `fable` alias resolves to, and the ID Claude Code recognizes as a Fable model for [automatic model fallback](\/docs\/en\/model-config#automatic-model-fallback) on third-party providers. See [Model configuration](\/docs\/en\/model-config#environment-variables)","description_source":"docs","described_by":{"doc":"claude-code\/env-vars","title":"Environment variables"},"presence":{"first_seen":"2.1.170","removed_in":null,"in_current_build":true,"newest_mined":"2.1.308","builds":120,"mined_builds":149,"first_cited":{"version":"2.1.170","released_at":"2026-06-09 16:15:44","spans":1}},"aliases":[],"entries":[{"version":"2.1.280","anchor":"new-models-are-unpinned-from-launch-time-forced-effort-by-de","heading":"New models are unpinned from launch-time forced effort by default; existing installs stay pinned","line":"Newly launched models like claude-opus-4-7 and claude-fable-5 stay pinned to a launch effort level unless unpinned, but only on installs that predate this build","released_at":"2026-09-22 15:44:39","reason":"found in this entry's text"},{"version":"2.1.170","anchor":"fable-5-environment-variables-for-custom-providers","heading":"Fable 5 Environment Variables for Custom Providers","line":null,"released_at":"2026-06-09 16:15:44","reason":"found in this entry's text"}],"entries_total":2,"docs":[{"source":"claude-code","path":"env-vars","title":"Environment variables","documented":true},{"source":"claude-code","path":"claude-platform-on-aws","title":"Claude Code on Claude Platform on AWS","documented":false},{"source":"claude-code","path":"model-config","title":"Model configuration","documented":false},{"source":"claude-code","path":"third-party-integrations","title":"Enterprise deployment overview","documented":false}],"docs_total":4,"gates":[],"related":[{"name":"ANTHROPIC_DEFAULT_FABLE_MODEL_DESCRIPTION","slug":"anthropic-default-fable-model-description","description":"Display description for the pinned Fable model in the `\/model` picker. When not set, the row shows a default description that begins `Custom Fable model`. See [Model configuration](\/docs\/en\/model-config#customize-pinned-model-display-and-capabilities)"},{"name":"ANTHROPIC_DEFAULT_FABLE_MODEL_NAME","slug":"anthropic-default-fable-model-name","description":"Display name for the pinned Fable model in the `\/model` picker. When not set, the row shows the model's name if Claude Code recognizes the pinned ID, and the pinned ID otherwise. See [Model configuration](\/docs\/en\/model-config#customize-pinned-model-display-and-capabilities)"}],"url":"https:\/\/changelogs.core-directive.com\/reference\/env\/anthropic-default-fable-model","family_url":"https:\/\/changelogs.core-directive.com\/reference\/env.json"}