What
Claude Code ships with a built-in list of models, the model_selector_config, that feeds the model picker. It includes entries such as claude-fable-5-1. One entry in it changed. That entry has a hard_limit of 950000 and supports fast mode.
- Its thinking option loses
always_on: !0. - It gains
min_claude_code_version: "2.1.280". Other entries carried"2.1.251". - It gains
voice_model: "claude-opus-5".
Thinking is the step-by-step reasoning a model can do before it answers.
Why
In practice, thinking is no longer forced on for that model's picker entry, and the entry only applies to Claude Code 2.1.280 or later.
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
The finding does not name the model this entry describes.