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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 v2.1.239

Effort is now a tagged value resolved against the current model

Under the hood
Useful3 Signal4
Effort

Thinking effort can now be set per model, with a default and an inherit option.

What

The session's thinking effort stopped being a plain string. It is now a tagged value that can say "inherit", "default", or a specific level, and the settings side is a table with a default plus per-model entries resolved against the model the main loop is running.

Details
  • The inherit and default cases are frozen shared singletons.
  • The table starts as { default: void 0, byModel: {} }, so with nothing configured the resolved effort is unchanged.
  • This is the initial session state on this build, not behind a flag.
Evidence

settingsEffortTable

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 v2.1.239 →