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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 v2.0.60

Pro Plan Opus Default Option

What: New experimental feature that allows Pro plan subscribers to use Opus 4.5 as their default model.

How it works: When enabled via the tengu_opus_default_pro_plan experiment, Pro plan users will see "Opus 4.5 ยท Most capable for complex work" as their default model option.

Details:

  • Controlled by experimental flag tengu_opus_default_pro_plan with variant opus_is_default
  • Added VI6() function at line 181554 that checks if the user's plan is "pro"
  • Added haA() function at line 181569 that checks if the Opus default experiment is enabled
  • Model description function uaA() at line 181634 now includes the Pro plan Opus option check

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 v2.0.60 →