Kimi K2 vs DeepSeek R1, best Open-Weights Model of 2026

Kimi K2DeepSeek R1
arenaElo13841389
humanEval90.190.2
sweBench65.849.2
mmlu89.190.8
gpqa64.771.5
aime7079.8
Price in/out ($/M)$0.57 / $2.3$0.7 / $2.5

Our verdict

R1 wins on reasoning (GPQA 71.5 vs 64.7); Kimi K2 wins on context (2M vs 128K) and general chat quality. For math and science, R1. For long-form writing, agents and APAC products, Kimi.

Kimi K2 · DeepSeek R1 · All AI model comparisons