Source Intelligence

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

All of v2.1.175 Home All releases olderv2.1.174 v2.1.176newer
Claude Code v2.1.175

  • Fixed plan-mode model selection not checking the allowlist when upgrading from Haiku or Opus plan model — the upgrade model is now validated and falls back gracefully with a warning rather than attempting to use an unauthorized model. (search for "Plan mode: the haiku plan upgrade model is not in the availableModels allowlist")
  • Fixed a regression where model name matching used an incomplete word-boundary check that could incorrectly match substring model names in the allowlist. The new matcher (ekK) requires non-alphanumeric boundaries on both sides of the match. (search for "ekK" — the new boundary-aware substring matcher)

See this entry in the whole of v2.1.175 →