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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 v1.0.74

Opus Plan Mode

What: New hybrid model option that uses Opus 4.1 in plan mode and Sonnet 4 for execution How to use:

claude /model
# Select "Opus Plan Mode" option

Details:

  • Description: "Use Opus 4.1 in plan mode, Sonnet 4 otherwise"
  • Provides optimal model selection based on the current operation mode
  • Automatically switches between models for planning vs implementation

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 v1.0.74 →