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GPT-5.1-Codex-Mini vs GPT-5 Codex

OpenAI vs OpenAI — benchmarks, pricing, and capabilities side by side.

  • GPT-5 Codex has the higher intelligence index (87.1 vs 84.7)
  • GPT-5.1-Codex-Mini is cheaper ($0.25 vs $1.25 per 1M input)
  • GPT-5 Codex is faster
GPT-5.1-Codex-MiniGPT-5 Codex
Intelligence index84.787.1
DeveloperOpenAIOpenAI
TypeMultimodalMultimodal
AccessAPI onlyAPI only
Context window400,000 tokens400,000 tokens
Input price$0.25 / 1M$1.25 / 1M
Output price$2.00 / 1M$10.00 / 1M
Speed175 tok/s180 tok/s
ReleasedNovember 13, 2025September 23, 2025
Parameters
Input modalitiesImage, TextText, Image
Output modalitiesTextText

Shared benchmarks

GPT-5.1-Codex-Mini
GPT-5 Codex
AIME 2025
91.7
98.7
GPQA Diamond
81.3
83.7
Humanity’s Last Exam
16.9
25.6
LiveCodeBench
83.6
84
MMLU-Pro
82
86.5