Kimi K2.5 vs o3

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

Quick Verdict

o3 wins overall with a score of 67 vs 62 (5 point difference).o3 wins 4 out of 4 categories.

Knowledge

o3

Kimi K2.5

74.8

o3

85.3

77
MMLU
86
76
GPQA
87
74
SuperGPQA
85
72
OpenBookQA
83

Coding

o3

Kimi K2.5

69

o3

78

69
HumanEval
78

Mathematics

o3

Kimi K2.5

76

o3

87

77
AIME 2023
88
79
AIME 2024
90
78
AIME 2025
89
73
HMMT Feb 2023
84
75
HMMT Feb 2024
86
74
HMMT Feb 2025
85
76
BRUMO 2025
87

Reasoning

o3

Kimi K2.5

73

o3

83

74
SimpleQA
84
72
MuSR
82

Frequently Asked Questions

Which is better, Kimi K2.5 or o3?

o3 scores higher overall with 67 vs 62, a difference of 5 points across all benchmarks.

Which is better for knowledge tasks, Kimi K2.5 or o3?

o3 leads in knowledge tasks with an average score of 85.3 vs 74.8.

Which is better for coding, Kimi K2.5 or o3?

o3 leads in coding with an average score of 78 vs 69.

Which is better for math, Kimi K2.5 or o3?

o3 leads in math with an average score of 87 vs 76.

Which is better for reasoning, Kimi K2.5 or o3?

o3 leads in reasoning with an average score of 83 vs 73.