What
The usage data Claude Code sends about each request to the model now includes how many milliseconds were spent preparing the request before it went out.
Why
This only adds a measurement. Nothing about how Claude Code behaves changes.
Usage data now records how long an API request takes to prepare
Claude Code's usage data now includes how long it took to prepare each request before sending it
Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
TelemetryArea: what it touches
Internal ChangesKind: in v2.1.285,
Internal ChangesSection of the release