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GPT-5.1 vs K2 Think V2

OpenAI vs MBZUAI Institute of Foundation Models — benchmarks, pricing, and capabilities side by side.

  • GPT-5.1 has the higher intelligence index (89 vs 71.3)
  • K2 Think V2 is cheaper ($0.00 vs $1.25 per 1M input)
GPT-5.1K2 Think V2
Intelligence index8971.3
DeveloperOpenAIMBZUAI Institute of Foundation Models
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, 2025December 15, 2025
Parameters
Input modalitiesText, Image
Output modalitiesText

Shared benchmarks

GPT-5.1
K2 Think V2
GPQA Diamond
88.1
71.3
Humanity’s Last Exam
26.5
9.5