benchlm.ai

Claude Sonnet 4.5 vs Kimi K2

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

Quick Verdict

Claude Sonnet 4.5 wins overall with a score of 74 vs 23 (51 point difference).Claude Sonnet 4.5 wins 4 out of 4 categories.

Claude Sonnet 4.5

CreatorAnthropic
TypeProprietary
Context1M
Score74

Kimi K2

CreatorMoonshot AI
TypeProprietary
Context128K
Score23

Knowledge

Claude Sonnet 4.5

Claude Sonnet 4.5

92

Kimi K2

29.8

95
MMLU
32
93
GPQA
31
91
SuperGPQA
29
89
OpenBookQA
27

Coding

Claude Sonnet 4.5

Claude Sonnet 4.5

87

Kimi K2

24

87
HumanEval
24

Mathematics

Claude Sonnet 4.5

Claude Sonnet 4.5

96

Kimi K2

31

97
AIME 2023
32
99
AIME 2024
34
98
AIME 2025
33
93
HMMT Feb 2023
28
95
HMMT Feb 2024
30
94
HMMT Feb 2025
29
96
BRUMO 2025
31

Reasoning

Claude Sonnet 4.5

Claude Sonnet 4.5

90

Kimi K2

29

91
SimpleQA
30
89
MuSR
28

Frequently Asked Questions

Which is better, Claude Sonnet 4.5 or Kimi K2?

Claude Sonnet 4.5 scores higher overall with 74 vs 23, a difference of 51 points across all benchmarks.

Which is better for knowledge tasks, Claude Sonnet 4.5 or Kimi K2?

Claude Sonnet 4.5 leads in knowledge tasks with an average score of 92 vs 29.8.

Which is better for coding, Claude Sonnet 4.5 or Kimi K2?

Claude Sonnet 4.5 leads in coding with an average score of 87 vs 24.

Which is better for math, Claude Sonnet 4.5 or Kimi K2?

Claude Sonnet 4.5 leads in math with an average score of 96 vs 31.

Which is better for reasoning, Claude Sonnet 4.5 or Kimi K2?

Claude Sonnet 4.5 leads in reasoning with an average score of 90 vs 29.

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