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AI & ML · Function

chat.completions

The Completions API is a legacy text-generation endpoint. It takes a single prompt string, but the documentation recommends using the Responses API or Chat Completions for current models.

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Syntax

POST /v1/completions

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  • Responses API
  • Chat Completions
  • prompt
  • max_tokens
  • finish_reason
  • stop
  • n
  • best_of

Source: Completions API | OpenAI API. Checked 2026-11-03.