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Gemini 3 Pro vs GPT-5.2-Codex

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

  • GPT-5.2-Codex has the higher intelligence index (89.9 vs 82.8)
  • GPT-5.2-Codex is cheaper ($1.75 vs $2.00 per 1M input)
  • Gemini 3 Pro is faster
  • Gemini 3 Pro has a larger context window (1M)
Gemini 3 ProGPT-5.2-Codex
Intelligence index82.889.9
DeveloperGoogleOpenAI
TypeMultimodalMultimodal
AccessAPI onlyAPI only
Context window1,000,000 tokens400,000 tokens
Input price$2.00 / 1M$1.75 / 1M
Output price$12.00 / 1M$14.00 / 1M
Speed141 tok/s106 tok/s
ReleasedNovember 18, 2025January 14, 2026
Parameters
Input modalitiesText, Image, Audio, VideoText, Image
Output modalitiesTextText

Shared benchmarks

Gemini 3 Pro
GPT-5.2-Codex
GPQA Diamond
91.9
89.9
Humanity’s Last Exam
37.5
33.5