AI Hub
← All models

GPT-5.1 vs o3

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

  • GPT-5.1 has the higher intelligence index (89 vs 71.6)
  • GPT-5.1 is cheaper ($1.25 vs $2.00 per 1M input)
  • GPT-5.1 is faster
  • GPT-5.1 has a larger context window (400K)
GPT-5.1o3
Intelligence index8971.6
DeveloperOpenAIOpenAI
TypeLLMLLM
AccessAPI onlyAPI only
Context window400,000 tokens200,000 tokens
Input price$1.25 / 1M$2.00 / 1M
Output price$10.00 / 1M$8.00 / 1M
Speed115 tok/s50 tok/s
ReleasedNovember 12, 2025April 16, 2025
Parameters
Input modalitiesText, ImageText, Image
Output modalitiesTextText

Shared benchmarks

GPT-5.1
o3
AIME 2025
94
86.4
GPQA Diamond
88.1
87.7
Humanity’s Last Exam
26.5
24.3
LiveCodeBench
86.8
80.8
MMLU-Pro
87
85.3