AI API Latency Metrics: TTFT, First Response, and Output Speed
This story is from 2026-10-20. It is preserved in the archive; the latest stories are on the live feed.
A request-timeline guide to upstream headers, first SSE event, first effective response, first visible text, end-to-end latency, and output speed. AI API latency is not one number. For a streaming request, record when the upstream headers arrive, when the first non-empty SSE event arrives, when the…
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- 2026-10-20 02:09 · DEV Community — AI
AI API Latency Metrics: TTFT, First Response, and Output Speed