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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.

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Claude Code v2.0.0

Opusplan Fallback Mode

What: Removed "Opus Plan Mode" model fallback strategy

Details:

  • Previously: "Use Opus 4.1 in plan mode, Sonnet 4 otherwise"
  • This specific fallback configuration is no longer available
  • Standard model selection and rate limit fallback still work
  • Evidence: Variable D31 at line 368627, function U31() at line 368577 in v1.0.128 - removed in v2.0.0

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.0.0 →