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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 21 Aug 2026

Successful API calls note when they ran at low priority

Under the hood

Useful1 Signal2

Telemetry

Successful requests now record whether they went out on the low-priority path.

What

The success event for an API request now carries a marker when the request went out on the low-priority path. Only set for those requests.

Evidence

is_low_priority

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

See this entry in the whole of v2.1.239 →