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Gemini 2.5 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 71.6)
  • Gemini 2.5 Pro is cheaper ($1.25 vs $1.75 per 1M input)
  • GPT-5.2-Codex is faster
  • Gemini 2.5 Pro has a larger context window (1M)
Gemini 2.5 ProGPT-5.2-Codex
Intelligence index71.689.9
DeveloperGoogleOpenAI
TypeMultimodalMultimodal
AccessAPI onlyAPI only
Context window1,048,576 tokens400,000 tokens
Input price$1.25 / 1M$1.75 / 1M
Output price$10.00 / 1M$14.00 / 1M
Speed85 tok/s106 tok/s
ReleasedMarch 25, 2025January 14, 2026
Parameters
Input modalitiesText, Image, Audio, VideoText, Image
Output modalitiesTextText

Shared benchmarks

Gemini 2.5 Pro
GPT-5.2-Codex
GPQA Diamond
84
89.9
Humanity’s Last Exam
17.8
33.5