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GPT-5.1 vs Kimi K2 0905

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

  • GPT-5.1 has the higher intelligence index (89 vs 71)
  • Kimi K2 0905 is cheaper ($0.60 vs $1.25 per 1M input)
  • GPT-5.1 is faster
  • GPT-5.1 has a larger context window (400K)
GPT-5.1Kimi K2 0905
Intelligence index8971
DeveloperOpenAIMoonshot AI
TypeLLMLLM
AccessAPI onlyAPI only
Context window400,000 tokens262,144 tokens
Input price$1.25 / 1M$0.60 / 1M
Output price$10.00 / 1M$2.50 / 1M
Speed115 tok/s16 tok/s
ReleasedNovember 12, 2025September 5, 2025
Parameters1000000000000
Input modalitiesText, Image
Output modalitiesText

Shared benchmarks

GPT-5.1
Kimi K2 0905
AIME 2025
94
57.3
GPQA Diamond
88.1
75.8
Humanity’s Last Exam
26.5
6.3
LiveCodeBench
86.8
61
MMLU-Pro
87
82.5