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GPT-5.1 vs Grok

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

  • GPT-5.1 has the higher intelligence index (89 vs 53.8)
  • Grok is cheaper ($0.00 vs $1.25 per 1M input)
GPT-5.1Grok
Intelligence index8953.8
DeveloperOpenAIxAI
TypeLLMLLM
AccessAPI only
Context window400,000 tokens
Input price$1.25 / 1M$0.00 / 1M
Output price$10.00 / 1M$0.00 / 1M
Speed115 tok/s
ReleasedNovember 12, 2025August 13, 2024
Parameters
Input modalitiesText, Image
Output modalitiesText

Shared benchmarks

GPT-5.1
Grok
GPQA Diamond
88.1
47.1
Humanity’s Last Exam
26.5
4.7
LiveCodeBench
86.8
24.1
MMLU-Pro
87
70.3