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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

Sonnet 4.5 Migration

What: Automatic model upgrade for existing users

Details:

  • Users with explicit model settings are migrated to Sonnet 4.5
  • Migration timestamp tracked to show "Model updated to Sonnet 4.5" notification
  • One-time migration prevents repeated notifications
  • Graceful handling of users who prefer other models
  • Evidence: v4Q() migration function at line 443290, notification in NRB() at line 430680 in v2.0.0

See this entry in the whole of v2.0.0 →