benchlm.ai

Grok 4.1 Fast vs Kimi K2.5

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

Quick Verdict

Grok 4.1 Fast wins overall with a score of 73 vs 62 (11 point difference).Grok 4.1 Fast wins 4 out of 4 categories.

Grok 4.1 Fast

CreatorxAI
TypeProprietary
Context2M
Score73

Kimi K2.5

CreatorMoonshot AI
TypeOpen Weight
Context128K
Score62

Knowledge

Grok 4.1 Fast

Grok 4.1 Fast

91

Kimi K2.5

74.8

94
MMLU
77
92
GPQA
76
90
SuperGPQA
74
88
OpenBookQA
72

Coding

Grok 4.1 Fast

Grok 4.1 Fast

86

Kimi K2.5

69

86
HumanEval
69

Mathematics

Grok 4.1 Fast

Grok 4.1 Fast

95

Kimi K2.5

76

96
AIME 2023
77
98
AIME 2024
79
97
AIME 2025
78
92
HMMT Feb 2023
73
94
HMMT Feb 2024
75
93
HMMT Feb 2025
74
95
BRUMO 2025
76

Reasoning

Grok 4.1 Fast

Grok 4.1 Fast

89

Kimi K2.5

73

90
SimpleQA
74
88
MuSR
72

Frequently Asked Questions

Which is better, Grok 4.1 Fast or Kimi K2.5?

Grok 4.1 Fast scores higher overall with 73 vs 62, a difference of 11 points across all benchmarks.

Which is better for knowledge tasks, Grok 4.1 Fast or Kimi K2.5?

Grok 4.1 Fast leads in knowledge tasks with an average score of 91 vs 74.8.

Which is better for coding, Grok 4.1 Fast or Kimi K2.5?

Grok 4.1 Fast leads in coding with an average score of 86 vs 69.

Which is better for math, Grok 4.1 Fast or Kimi K2.5?

Grok 4.1 Fast leads in math with an average score of 95 vs 76.

Which is better for reasoning, Grok 4.1 Fast or Kimi K2.5?

Grok 4.1 Fast leads in reasoning with an average score of 89 vs 73.

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