Evaluation, Testing & Optimization·Task 4.5·Bloom: apply·Difficulty 3/5·8 min read·Updated 2026-07-14

P95 Latency as the Design Target

Optimize token usage, latency, and cost-performance trade-offs

SUBy Solomon UdohReviewed by Solomon UdohAI-assisted · human-reviewed
In short
P95 latency is the value below which 95% of requests complete, making it a more useful design target than the median because SLA breaches are driven by the slower requests at the tail, not the typical one. A demo tested one request at a time will not reveal p95 latency under concurrent production load. Latency is driven by task complexity, model size, and output length, while volume alone primarily pressures cost rather than latency at moderate request rates.

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