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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 v2.1.219

Effort profile added for claude-opus-5

Under the hood
Useful3 Signal0
Model Config Notable

A reasoning-effort table now includes settings for a model named claude-opus-5, with new medium and high profiles.

What

The per-model reasoning-effort table gains a row for claude-opus-5, so effort levels map to model-specific settings when that model is in effect.

Details
  • low reuses the shared low profile; max reuses the shared max
  • medium and high both map to a new cell "o5-bmin" with modelEffort: "typed" and no finder budget hint
  • xhigh reuses the existing o48-xhigh-v1 profile
  • the cell name "o5-bmin" does not appear in 2.1.218, and there is a downstream branch that special-cases it
Evidence

o5-bmin

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 v2.1.219 →