Turn state stays off the speech path
0.65 ms0.83 ms p95Expression inference on CPU, measured with a 25 ms causal analysis window and recurrent updates every 10 ms.
Measured behavior
Numbers with
boundaries
A latency number without its start and end points is an adjective with digits. Every figure here says what was measured.
Live serving measurements
What the homepage numbers mean
These figures describe different parts of the running system. They should not be added together or treated as one end-to-end fixture.
The rendered face reaches the call
~155 msat 30 fpsSource canvas to decoded WebRTC. This is the visual transport boundary, not speech-response latency.
A warm conversation answers
1.8–2.1 sp50Microphone speech to first returned audio, stable from one to eight concurrent sessions. At two conversations per T4, p95 was 2.183 seconds. A native-live baseline was faster on the same fixture: 1.054 seconds versus 1.955 seconds.
Silence is spent generating
~1.2 swhen applicableMicrophone speech to first returned audio when speculative endpointing applies. If speech resumes, the speculative work is discarded.
Tools do not stall the turn
22.1 sand 9.7 sTwo concurrent background think calls in the recorded homepage demo. Both returned while the conversation continued; neither blocked a turn.
Separate forty-turn fixture
What happens
on turn forty
One scripted conversation, forty turns, retained context verified at the end. The latency boundary is final speech sample leaving the client to first response-audio byte arriving.
Presence p50. It was slower to first audio than both hosted realtime APIs in this run.
Presence answered while its long-running tool continued. The same probe took 5.8 seconds on one hosted API and remained blocked on another.
Measured on one hosted realtime API. The other measured 1.25×. Presence remained 1.0× because it bills occupied time.
These are single runs on one fixture, not a universal ranking. Models, prices, caching, regions, and serving paths change. The public harness and raw per-turn data are the durable claim.
Feel the boundary