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Gemini 2.0 Flash Thinking vs GPT-5.1-Codex

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

  • GPT-5.1-Codex has the higher intelligence index (88.2 vs 69.1)
  • Gemini 2.0 Flash Thinking is cheaper ($0.00 vs $1.25 per 1M input)
Gemini 2.0 Flash ThinkingGPT-5.1-Codex
Intelligence index69.188.2
DeveloperGoogleOpenAI
TypeMultimodalMultimodal
AccessAPI onlyAPI only
Context window400,000 tokens
Input price$0.00 / 1M$1.25 / 1M
Output price$0.00 / 1M$10.00 / 1M
Speed188 tok/s
ReleasedJanuary 21, 2025November 13, 2025
Parameters
Input modalitiesText, Image
Output modalitiesText

Shared benchmarks

Gemini 2.0 Flash Thinking
GPT-5.1-Codex
GPQA Diamond
74.2
86
Humanity’s Last Exam
7.1
23.4
LiveCodeBench
32.1
84.9
MMLU-Pro
79.8
86