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GPT-5.1 vs GPT-5.4

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

  • GPT-5.1 has the higher intelligence index (89 vs 74.9)
  • GPT-5.1 is cheaper ($1.25 vs $2.50 per 1M input)
  • GPT-5.1 is faster
  • GPT-5.4 has a larger context window (1.1M)
GPT-5.1GPT-5.4
Intelligence index8974.9
DeveloperOpenAIOpenAI
TypeLLMLLM
AccessAPI onlyAPI only
Context window400,000 tokens1,050,000 tokens
Input price$1.25 / 1M$2.50 / 1M
Output price$10.00 / 1M$15.00 / 1M
Speed115 tok/s84 tok/s
ReleasedNovember 12, 2025March 5, 2026
Parameters
Input modalitiesText, ImageText, Image
Output modalitiesTextText

Shared benchmarks

GPT-5.1
GPT-5.4
GPQA Diamond
88.1
92
Humanity’s Last Exam
26.5
41.6