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Gemini 1.5 Flash 8B 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 48.4)
  • Gemini 1.5 Flash 8B is cheaper ($0.07 vs $1.25 per 1M input)
  • GPT-5 Codex is faster
  • Gemini 1.5 Flash 8B has a larger context window (1M)
Gemini 1.5 Flash 8BGPT-5 Codex
Intelligence index48.487.1
DeveloperGoogleOpenAI
TypeMultimodalMultimodal
AccessAPI onlyAPI only
Context window1,048,576 tokens400,000 tokens
Input price$0.07 / 1M$1.25 / 1M
Output price$0.30 / 1M$10.00 / 1M
Speed150 tok/s180 tok/s
ReleasedMarch 15, 2024September 23, 2025
Parameters8000000000
Input modalitiesText, Image
Output modalitiesText

Shared benchmarks

Gemini 1.5 Flash 8B
GPT-5 Codex
GPQA Diamond
38.4
83.7
Humanity’s Last Exam
4.5
25.6
LiveCodeBench
21.7
84
MMLU-Pro
58.7
86.5