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Grok 4.20 0309 v2 vs Kimi K2 0905

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

  • Grok 4.20 0309 v2 has the higher intelligence index (91.1 vs 71)
  • Kimi K2 0905 is cheaper ($0.60 vs $2.00 per 1M input)
  • Grok 4.20 0309 v2 is faster
Grok 4.20 0309 v2Kimi K2 0905
Intelligence index91.171
DeveloperxAIMoonshot AI
TypeLLMLLM
AccessAPI only
Context window262,144 tokens
Input price$2.00 / 1M$0.60 / 1M
Output price$6.00 / 1M$2.50 / 1M
Speed105 tok/s16 tok/s
ReleasedApril 7, 2026September 5, 2025
Parameters1000000000000
Input modalities
Output modalities

Shared benchmarks

Grok 4.20 0309 v2
Kimi K2 0905
GPQA Diamond
91.1
75.8
Humanity’s Last Exam
32.2
6.3