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Gemini 3 Deep Think vs GPT-5 Codex

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

  • GPT-5 Codex has the higher intelligence index (87.1 vs 69.5)
  • Gemini 3 Deep Think is cheaper ($0.00 vs $1.25 per 1M input)
  • Gemini 3 Deep Think has a larger context window (1M)
Gemini 3 Deep ThinkGPT-5 Codex
Intelligence index69.587.1
DeveloperGoogleOpenAI
TypeMultimodalMultimodal
AccessAPI onlyAPI only
Context window1,000,000 tokens400,000 tokens
Input price$0.00 / 1M$1.25 / 1M
Output price$0.00 / 1M$10.00 / 1M
Speed180 tok/s
ReleasedNovember 18, 2025September 23, 2025
Parameters
Input modalitiesText, Image, Audio, VideoText, Image
Output modalitiesTextText

Shared benchmarks

Gemini 3 Deep Think
GPT-5 Codex
GPQA Diamond
93.8
83.7
Humanity’s Last Exam
41
25.6