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GPT-5.1 vs Grok 4

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

  • GPT-5.1 has the higher intelligence index (89 vs 78.2)
  • GPT-5.1 is cheaper ($1.25 vs $3.00 per 1M input)
  • GPT-5.1 is faster
  • GPT-5.1 has a larger context window (400K)
GPT-5.1Grok 4
Intelligence index8978.2
DeveloperOpenAIxAI
TypeLLMLLM
AccessAPI onlyAPI only
Context window400,000 tokens256,000 tokens
Input price$1.25 / 1M$3.00 / 1M
Output price$10.00 / 1M$15.00 / 1M
Speed115 tok/s100 tok/s
ReleasedNovember 12, 2025July 9, 2025
Parameters
Input modalitiesText, ImageText, Image
Output modalitiesTextText

Shared benchmarks

GPT-5.1
Grok 4
AIME 2025
94
91.7
GPQA Diamond
88.1
87.5
Humanity’s Last Exam
26.5
40
LiveCodeBench
86.8
79
MMLU-Pro
87
86.6