You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
ElsewhereArea: what it touches
ImprovementsKind: in v2.1.307,
ImprovementsSection of the release
Unclear Whether an unrecognised model still gets a default context window from somewhere else is not established.
What
The context window is how much text a model can take in at once. When Claude Code looks up that size for a model, it used to fall back to one million tokens if no size was found. A token is a small piece of text. That fallback has been removed, so a model Claude Code does not recognise now gets no size from this lookup.
Why
If you use a model Claude Code does not recognise, the context size it assumes for that model may be different now.
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 doubtWhether an unrecognised model still gets a default context window from somewhere else is not established.
