Is P99 Latency the same as tail latency?

Yes — tail latency, 99th percentile latency are common aliases for P99 Latency.

What concepts are related to P99 Latency?

Closely related concepts include time to first token, tokens per second, throughput.

ModelRefs / P99 Latency — AI Glossary

P99 Latency — AI Glossary

The 99th-percentile request latency; the worst-case response time experienced by 1-in-100 requests under load.

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