{"version":"2.1.170","anchor":"claude-fable-5-model-support","canonical_anchor":"claude-fable-5-model-support","heading":"Claude Fable 5 Model Support","tier":null,"area":null,"scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.170\/e\/claude-fable-5-model-support","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.170","markdown":"### Claude Fable 5 Model Support\n\n**What**\n\nClaude Fable 5 is now a supported model in Claude Code, positioned as the most capable option for the hardest and longest-running tasks.\n\n**Usage**\n\n`claude --model fable claude --model claude-fable-5` **Details** - Alias `fable` (and `fable[1m]` for 1M context) resolve to Fable 5 - Full model IDs: `claude-fable-5` (firstParty, vertex, foundry, gateway), `anthropic.claude-fable-5` (Bedrock\/Mantle) - Context window: 64k default output \/ 128k max \u2014 same as Opus 4.8 - Default effort level: `high` (same as Opus 4.8) - Fable 5 appears at the top of the `\/model` picker for eligible accounts - A companion model, `claude-mythos-5`, is also registered internally for the safety-refusal fallback lane - The `\/model` command's help text now reads: \"Provide an alias for the latest model (e.g. 'fable', 'opus', or 'sonnet') or a model's full name (e.g. 'claude-fable-5').\" **Evidence** Model ID registration and picker entry (search for `\"claude-fable-5\"` and `\"Fable 5 \u00b7 Most capable for your hardest and longest-running tasks\"`)"}