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Grok 4.3 vs Kimi K2.6

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

  • Grok 4.3 has the higher intelligence index (90.1 vs 74.9)
  • Kimi K2.6 is cheaper ($0.73 vs $1.25 per 1M input)
  • Grok 4.3 is faster
  • Grok 4.3 has a larger context window (1M)
Grok 4.3Kimi K2.6
Intelligence index90.174.9
DeveloperxAIMoonshot AI
TypeLLMLLM
AccessAPI onlyOpen weights
Context window1,000,000 tokens262,144 tokens
Input price$1.25 / 1M$0.73 / 1M
Output price$2.50 / 1M$3.49 / 1M
Speed88 tok/s57 tok/s
ReleasedMay 6, 2026April 20, 2026
Parameters1T (32B active)
Input modalitiesText, ImageText, Image
Output modalitiesTextText

Shared benchmarks

Grok 4.3
Kimi K2.6
GPQA Diamond
90.1
91.1
Humanity’s Last Exam
35
35.9