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GPT-5.1 vs GPT-5 Pro

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

  • GPT-5.1 has the higher intelligence index (89 vs 88.4)
  • GPT-5.1 is cheaper ($1.25 vs $15.00 per 1M input)
GPT-5.1GPT-5 Pro
Intelligence index8988.4
DeveloperOpenAIOpenAI
TypeLLMLLM
AccessAPI onlyAPI only
Context window400,000 tokens400,000 tokens
Input price$1.25 / 1M$15.00 / 1M
Output price$10.00 / 1M$120.00 / 1M
Speed115 tok/s
ReleasedNovember 12, 2025October 6, 2025
Parameters
Input modalitiesText, ImageText, Image
Output modalitiesTextText

Shared benchmarks

GPT-5.1
GPT-5 Pro
GPQA Diamond
88.1
88.4
Humanity’s Last Exam
26.5
42