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Gemini 3 Flash vs GPT-5.1-Codex-Mini

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

  • Gemini 3 Flash has the higher intelligence index (90.2 vs 84.7)
  • GPT-5.1-Codex-Mini is cheaper ($0.25 vs $0.50 per 1M input)
  • Gemini 3 Flash is faster
  • Gemini 3 Flash has a larger context window (1M)
Gemini 3 FlashGPT-5.1-Codex-Mini
Intelligence index90.284.7
DeveloperGoogleOpenAI
TypeMultimodalMultimodal
AccessAPI onlyAPI only
Context window1,048,576 tokens400,000 tokens
Input price$0.50 / 1M$0.25 / 1M
Output price$3.00 / 1M$2.00 / 1M
Speed191 tok/s175 tok/s
ReleasedDecember 17, 2025November 13, 2025
Parameters
Input modalitiesText, Image, Audio, VideoImage, Text
Output modalitiesTextText

Shared benchmarks

Gemini 3 Flash
GPT-5.1-Codex-Mini
AIME 2025
97
91.7
GPQA Diamond
90.4
81.3
Humanity’s Last Exam
34.7
16.9
LiveCodeBench
90.8
83.6
MMLU-Pro
89
82