Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
4Signal: worth watching, 1 to 5
ThinkingArea: what it touches
Internal ChangesKind: in v2.1.300,
What probably matters to youSection of the release
Unclear Which models are marked as having thinking always on is not stated.
What
Claude Code keeps a record of what each model can do. The part about thinking (the model reasoning step by step before it answers) already covered whether thinking is supported, whether the model refuses requests with thinking turned off, and whether it limits effort when thinking is off. It now also has an "always on" entry.
Why
Some models have thinking that cannot be turned off. Claude Code can now record that about a model.
How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtWhich models are marked as having thinking always on is not stated.
