Unverified50% confidenceFactExact time
In the OpenAI Chat Completions API, max_tokens is an early field used to limit the total number of tokens in the generated content; OpenAI introduced max_completion_tokens in the o1 series and later reasoning models to constrain the token upper limit of the entire completion, and gradually recommends that new models use the latter.
1
Sources
50%
Confidence
Long-term
Relevance
10/17/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedOpenAI-compatible endpoints follow the OpenAI Chat Completions API specification, but 'compatible' does not mean 'behaviorally identical,' and vendors may differ in their implementations of token counting rules and max_tokens semantics.72% similarUnverifiedIn OpenAI's Chat Completions API, system prompts exist in the form of {"role": "system"} and have a higher instruction priority than user messages.71% similar
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