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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 v2.1.228

Usage reports a thinking-token count

Under the hood
Useful3 Signal3
Token Usage

Token usage now includes a thinking-token count, accumulated correctly in both streaming and non-streaming modes.

What

Token usage now carries an output_tokens_details object with a thinking_tokens field, parsed from responses and combined correctly across both streaming and non-streaming accumulation.

Details
  • The zero-usage baseline starts at { thinking_tokens: 0 }.
  • thinking_tokens may be null, and placeholder or synthetic usage records set output_tokens_details to null.
Evidence

output_tokens_details

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 v2.1.228 →