ModelRefs / N Completions — AI Glossary
N Completions — AI Glossary
An API parameter requesting multiple independent completions for a single prompt, useful for sampling diversity and best-of-N selection.
Overview
Setting n>1 in the chat completions API returns multiple independent responses sampled with the configured temperature. Used for: pass@k evaluation, best-of-N selection (generate N, pick highest reward model score), and diversity analysis. Note: all N completions are generated from the same prefill, so input tokens are counted once; output tokens are N×.
Reference details
| Topic | ecosystem |
|---|---|
| Also known as | best-of-n, multiple completions |
| Last reviewed | 2026-06-24 |
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Frequently asked questions
What is N Completions?
An API parameter requesting multiple independent completions for a single prompt, useful for sampling diversity and best-of-N selection.
Is N Completions the same as best-of-n?
Yes — best-of-n, multiple completions are common aliases for N Completions.
What concepts are related to N Completions?
Closely related concepts include passatk, sampling, logprobs.