How to use Fable 5.2 as the default in Claude Code and switch back to 5.1

Since Claude Code 2.1.321, the default Fable model is Fable 5.2 (claude-fable-5-2). It has a 1M-token context and costs $8 per million input tokens, $40 per million output tokens, and $0.20 per million cache-read tokens.

If you had picked Fable 5.1 in /model, that saved pick moves to fable. On Pro and Max plans it changes right away; on Team and Enterprise it changes once your organization allows it. To stay on 5.1, set the model explicitly.

/model claude-fable-5-1

Run claude --version first to check you are on 2.1.321 or later.