benchlm.ai

Claude Sonnet 4.5 vs Kimi K2.5

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 62 (12 point difference).Claude Sonnet 4.5 wins 4 out of 4 categories.

Claude Sonnet 4.5

CreatorAnthropic
TypeProprietary
Context1M
Score74

Kimi K2.5

CreatorMoonshot AI
TypeOpen Weight
Context128K
Score62

Knowledge

Claude Sonnet 4.5

Claude Sonnet 4.5

92

Kimi K2.5

74.8

95
MMLU
77
93
GPQA
76
91
SuperGPQA
74
89
OpenBookQA
72

Coding

Claude Sonnet 4.5

Claude Sonnet 4.5

87

Kimi K2.5

69

87
HumanEval
69

Mathematics

Claude Sonnet 4.5

Claude Sonnet 4.5

96

Kimi K2.5

76

97
AIME 2023
77
99
AIME 2024
79
98
AIME 2025
78
93
HMMT Feb 2023
73
95
HMMT Feb 2024
75
94
HMMT Feb 2025
74
96
BRUMO 2025
76

Reasoning

Claude Sonnet 4.5

Claude Sonnet 4.5

90

Kimi K2.5

73

91
SimpleQA
74
89
MuSR
72

Frequently Asked Questions

Which is better, Claude Sonnet 4.5 or Kimi K2.5?

Claude Sonnet 4.5 scores higher overall with 74 vs 62, a difference of 12 points across all benchmarks.

Which is better for knowledge tasks, Claude Sonnet 4.5 or Kimi K2.5?

Claude Sonnet 4.5 leads in knowledge tasks with an average score of 92 vs 74.8.

Which is better for coding, Claude Sonnet 4.5 or Kimi K2.5?

Claude Sonnet 4.5 leads in coding with an average score of 87 vs 69.

Which is better for math, Claude Sonnet 4.5 or Kimi K2.5?

Claude Sonnet 4.5 leads in math with an average score of 96 vs 76.

Which is better for reasoning, Claude Sonnet 4.5 or Kimi K2.5?

Claude Sonnet 4.5 leads in reasoning with an average score of 90 vs 73.

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