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OpenAI
GPT-5.1-Codex-Mini

GPT-5.1-Codex-Mini is a smaller and faster version of GPT-5.1-Codex

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Model details

Context window400,000 tokens
Max completion size72 tokens
Prompt cost / 1K tokens$0.00000025
Completion cost / 1K tokens$0.000002
Accepts
Produces

Benchmark performance

Overall

70
score
15th
placement

Cost

94
score
7th
placement

Logic

84
score
5th
placement

Speed

84
score
16th
placement

Scoring

34
score
14th
placement

Tool Use

39
score
6th
placement

Hallucination

43
score
18th
placement

Classification

29
score
3rd
placement

Structured Output

92
score
2nd
placement

Pricing

Usage pricing
Prompt$0.00000025
Completion$0.000002
RequestFREE
ImageFREE
Web SearchFREE
Internal ReasoningFREE
Input Cache ReadFREE
Input Cache WriteFREE

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