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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 v2.1.238

Thinking-token events emitted earlier in the stream loop

Under the hood
Useful2 Signal1
Elsewhere

Estimated thinking-token counts now reach the display earlier in each turn.

What

The event reporting estimated thinking tokens is now yielded immediately after queued emissions rather than after several other branches, so it reaches consumers earlier in each turn.

Evidence

[engine] yield-twin system/thinking_tokens

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.238 →