Under the hoodTier: how much it should matter to you
3Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
Token UsageArea: what it touches
Internal ChangesKind: in v2.1.228,
Internal ChangesSection of the release
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.
