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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 v2.0.51

Model Description Updates

  • Sonnet 4.5: "Best for everyday tasks" (was "Smartest model for daily use")
  • Opus: "Most capable for complex work"
  • Haiku 4.5: "Fastest for quick answers" (was "Fastest model for simple tasks")
  • Dynamic pricing display using jc() helper function
  • Evidence: Model options at qh1, kzB, xzB around line 224380

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 v2.0.51 →