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The simplest way to change models is to use the /model command directly within Claude Code. ... For Fable 5.2: claude --model claude-fable-5-2. For Haiku ...
Claude Fable models are the most capable models in Claude Code, suited to tasks larger than a single sitting. They sustain long autonomous sessions, investigate ...
Commands control Claude Code from inside a session. They provide a quick way to switch models, manage permissions, clear context, run a workflow, and more.
2026/6/9 -To use the 1M context window , the command is /model claude-fable-5[1m] . To change the thinking level, use /effort max (or high / default ). So ...
just type in /model claude-fable-5.
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2026/9/1 -Claude Code v2.1.257 makes Claude Fable 5.1 the default Fable model, adds timeFormat and timeZone settings, and adds a Containment Escape rule ...
Behavioral differences and prompting patterns for Claude Fable 5.1 and Claude Mythos 5.1, covering effort, progress updates, tool-call batching, ...
2026/7/4 -The model id is claude-fable-5 . It shares its underlying model with Claude Mythos 5 ( claude-mythos-5 ), which you cannot buy your way into: ...
2026/6/11 -Fable 5 supports five effort levels in Claude Code: low , medium , high , xhigh , and max . The default is high . You change it with /effort .
2026/6/9 -In Claude Code, run /model and select Fable from the model picker, or switch directly with: /model claude-fable-5.