Kimi K2 vs o3

Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.

Quick Verdict

o3 wins overall with a score of 67 vs 23 (44 point difference).o3 wins 4 out of 4 categories.

Knowledge

o3

Kimi K2

29.8

o3

85.3

32
MMLU
86
31
GPQA
87
29
SuperGPQA
85
27
OpenBookQA
83

Coding

o3

Kimi K2

24

o3

78

24
HumanEval
78

Mathematics

o3

Kimi K2

31

o3

87

32
AIME 2023
88
34
AIME 2024
90
33
AIME 2025
89
28
HMMT Feb 2023
84
30
HMMT Feb 2024
86
29
HMMT Feb 2025
85
31
BRUMO 2025
87

Reasoning

o3

Kimi K2

29

o3

83

30
SimpleQA
84
28
MuSR
82

Frequently Asked Questions

Which is better, Kimi K2 or o3?

o3 scores higher overall with 67 vs 23, a difference of 44 points across all benchmarks.

Which is better for knowledge tasks, Kimi K2 or o3?

o3 leads in knowledge tasks with an average score of 85.3 vs 29.8.

Which is better for coding, Kimi K2 or o3?

o3 leads in coding with an average score of 78 vs 24.

Which is better for math, Kimi K2 or o3?

o3 leads in math with an average score of 87 vs 31.

Which is better for reasoning, Kimi K2 or o3?

o3 leads in reasoning with an average score of 83 vs 29.