benchlm.ai

Claude Sonnet 4.5 vs Kimi K2.5 (Reasoning)

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 71 (3 point difference).Claude Sonnet 4.5 wins 4 out of 4 categories.

Claude Sonnet 4.5

CreatorAnthropic
TypeProprietary
Context1M
Score74

Kimi K2.5 (Reasoning)

CreatorMoonshot AI
TypeOpen Weight
Context128K
Score71

Knowledge

Claude Sonnet 4.5

Claude Sonnet 4.5

92

Kimi K2.5 (Reasoning)

89

95
MMLU
92
93
GPQA
90
91
SuperGPQA
88
89
OpenBookQA
86

Coding

Claude Sonnet 4.5

Claude Sonnet 4.5

87

Kimi K2.5 (Reasoning)

84

87
HumanEval
84

Mathematics

Claude Sonnet 4.5

Claude Sonnet 4.5

96

Kimi K2.5 (Reasoning)

93

97
AIME 2023
94
99
AIME 2024
96
98
AIME 2025
95
93
HMMT Feb 2023
90
95
HMMT Feb 2024
92
94
HMMT Feb 2025
91
96
BRUMO 2025
93

Reasoning

Claude Sonnet 4.5

Claude Sonnet 4.5

90

Kimi K2.5 (Reasoning)

87

91
SimpleQA
88
89
MuSR
86

Frequently Asked Questions

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

Claude Sonnet 4.5 scores higher overall with 74 vs 71, a difference of 3 points across all benchmarks.

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

Claude Sonnet 4.5 leads in knowledge tasks with an average score of 92 vs 89.

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

Claude Sonnet 4.5 leads in coding with an average score of 87 vs 84.

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

Claude Sonnet 4.5 leads in math with an average score of 96 vs 93.

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

Claude Sonnet 4.5 leads in reasoning with an average score of 90 vs 87.

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