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GPT-5.1 vs Kimi K2

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

  • GPT-5.1 has the higher intelligence index (89 vs 73.6)
  • Kimi K2 is cheaper ($0.57 vs $1.25 per 1M input)
  • GPT-5.1 is faster
  • GPT-5.1 has a larger context window (400K)
GPT-5.1Kimi K2
Intelligence index8973.6
DeveloperOpenAIMoonshot AI
TypeLLMLLM
AccessAPI onlyOpen weights
Context window400,000 tokens131,072 tokens
Input price$1.25 / 1M$0.57 / 1M
Output price$10.00 / 1M$2.30 / 1M
Speed115 tok/s26 tok/s
ReleasedNovember 12, 2025July 11, 2025
Parameters1T (32B active)
Input modalitiesText, ImageText
Output modalitiesTextText

Shared benchmarks

GPT-5.1
Kimi K2
AIME 2025
94
57
GPQA Diamond
88.1
76.6
Humanity’s Last Exam
26.5
7
LiveCodeBench
86.8
55.6
MMLU-Pro
87
82.4