benchlm.ai

Claude Opus 4.5 vs Kimi K2.5 (Reasoning)

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

Quick Verdict

Claude Opus 4.5 wins overall with a score of 79 vs 71 (8 point difference).Claude Opus 4.5 wins 4 out of 4 categories.

Claude Opus 4.5

CreatorAnthropic
TypeProprietary
Context200K
Score79

Kimi K2.5 (Reasoning)

CreatorMoonshot AI
TypeOpen Weight
Context128K
Score71

Knowledge

Claude Opus 4.5

Claude Opus 4.5

96

Kimi K2.5 (Reasoning)

89

99
MMLU
92
97
GPQA
90
95
SuperGPQA
88
93
OpenBookQA
86

Coding

Claude Opus 4.5

Claude Opus 4.5

91

Kimi K2.5 (Reasoning)

84

91
HumanEval
84

Mathematics

Claude Opus 4.5

Claude Opus 4.5

97.1

Kimi K2.5 (Reasoning)

93

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

Reasoning

Claude Opus 4.5

Claude Opus 4.5

94

Kimi K2.5 (Reasoning)

87

95
SimpleQA
88
93
MuSR
86

Frequently Asked Questions

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

Claude Opus 4.5 scores higher overall with 79 vs 71, a difference of 8 points across all benchmarks.

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

Claude Opus 4.5 leads in knowledge tasks with an average score of 96 vs 89.

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

Claude Opus 4.5 leads in coding with an average score of 91 vs 84.

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

Claude Opus 4.5 leads in math with an average score of 97.1 vs 93.

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

Claude Opus 4.5 leads in reasoning with an average score of 94 vs 87.

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