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How to Benchmark LLM API Performance: TTFT, Streaming Stability, and a Reproducible Method

This story is from 2026-10-28. It is preserved in the archive; the latest stories are on the live feed.

The short answer: LLM API performance comes down to three measurable things — the P95/P99 distribution of time-to-first-token (TTFT), streaming stability (the share of long outputs that finish without a silent mid-stream cutoff), and how prompt-cache hits amplify both speed and cost. Total latency…

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  1. 2026-10-28 18:38 · DEV Community — AI
    How to Benchmark LLM API Performance: TTFT, Streaming Stability, and a Reproducible Method

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