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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 v2.1.45

Default Model Updated to Sonnet 4.6

The default model throughout Claude Code has been updated from Sonnet 4.5 to Sonnet 4.6, including:

  • Model selection descriptions now reference Sonnet 4.6
  • 1M context window options updated to Sonnet 4.6
  • Haiku description now compares to Sonnet 4.6 instead of 4.5
  • Plan mode hybrid option now uses "Opus 4.6 in plan mode, Sonnet 4.6 otherwise"
Evidence

Model descriptions updated (search for "Sonnet 4.6 - best for everyday tasks")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

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 v2.1.45 →