Follow Discord
Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeReleasesv2.1.299entry #49

Claude Code v2.1.299 ·

Unknown-model warning becomes a visible banner, with a CLAUDE_CODE_MAX_CONTEXT_TOKENS exemption

An unrecognized model now gets a visible warning banner, and setting CLAUDE_CODE_MAX_CONTEXT_TOKENS can exempt first-party models from the check

Group of 2 Use it now Improvements
JSON All of v2.1.299
Use it nowTier: how much it should matter to you
2Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
ElsewhereArea: what it touches
ImprovementsKind: in v2.1.299,
What probably matters to youSection of the release

What

The context window is how much conversation a model can hold at once. When Claude Code does not recognize a model, it assumes a window size and compacts (summarizes older conversation) to stay within it.

  • The warning is no longer one plain string. It now carries the model, the assumed window, a short text and a detail.
  • A new 'model-unrecognized' warning shows: 'Model ... isn't recognized · context assumed to be N tokens · update Claude Code, or see the docs'. The app keeps it in a new unknownModelWindowWarning field next to the model deprecation warning.
  • Auto-compact still keeps the session within the assumed window, and CLAUDE_CODE_DISABLE_UNKNOWN_MODEL_WINDOW_ENFORCEMENT=1 still restores the previous behaviour.
  • The check was moved into a separate helper. A new function exempts first-party models from it when CLAUDE_CODE_MAX_CONTEXT_TOKENS is set to a positive value and the model qualifies for it.

Why

People on a model Claude Code does not recognize, such as a gateway alias, now see a visible warning. Setting CLAUDE_CODE_MAX_CONTEXT_TOKENS may also change whether that warning applies.

See this entry in the whole of v2.1.299 →

Feedback