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GPT-5.1 vs GPT-5 nano

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

  • GPT-5.1 has the higher intelligence index (89 vs 71.2)
  • GPT-5 nano is cheaper ($0.05 vs $1.25 per 1M input)
  • GPT-5 nano is faster
GPT-5.1GPT-5 nano
Intelligence index8971.2
DeveloperOpenAIOpenAI
TypeLLMLLM
AccessAPI onlyAPI only
Context window400,000 tokens400,000 tokens
Input price$1.25 / 1M$0.05 / 1M
Output price$10.00 / 1M$0.40 / 1M
Speed115 tok/s500 tok/s
ReleasedNovember 12, 2025August 7, 2025
Parameters
Input modalitiesText, ImageText, Image
Output modalitiesTextText

Shared benchmarks

GPT-5.1
GPT-5 nano
AIME 2025
94
85.2
GPQA Diamond
88.1
71.2
Humanity’s Last Exam
26.5
8.7
LiveCodeBench
86.8
78.9
MMLU-Pro
87
78