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GPT-5.1 vs Grok Code Fast 1

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

  • GPT-5.1 has the higher intelligence index (89 vs 65.3)
  • Grok Code Fast 1 is cheaper ($0.00 vs $1.25 per 1M input)
GPT-5.1Grok Code Fast 1
Intelligence index8965.3
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 28, 2025
Parameters
Input modalitiesText, Image
Output modalitiesText

Shared benchmarks

GPT-5.1
Grok Code Fast 1
AIME 2025
94
43.3
GPQA Diamond
88.1
72.7
Humanity’s Last Exam
26.5
7.5
LiveCodeBench
86.8
65.7
MMLU-Pro
87
79.3