benchlm.ai

Grok 4.1 Fast vs Kimi K2.5 (Reasoning)

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 71 (2 point difference).Grok 4.1 Fast wins 4 out of 4 categories.

Grok 4.1 Fast

CreatorxAI
TypeProprietary
Context2M
Score73

Kimi K2.5 (Reasoning)

CreatorMoonshot AI
TypeOpen Weight
Context128K
Score71

Knowledge

Grok 4.1 Fast

Grok 4.1 Fast

91

Kimi K2.5 (Reasoning)

89

94
MMLU
92
92
GPQA
90
90
SuperGPQA
88
88
OpenBookQA
86

Coding

Grok 4.1 Fast

Grok 4.1 Fast

86

Kimi K2.5 (Reasoning)

84

86
HumanEval
84

Mathematics

Grok 4.1 Fast

Grok 4.1 Fast

95

Kimi K2.5 (Reasoning)

93

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

Reasoning

Grok 4.1 Fast

Grok 4.1 Fast

89

Kimi K2.5 (Reasoning)

87

90
SimpleQA
88
88
MuSR
86

Frequently Asked Questions

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

Grok 4.1 Fast scores higher overall with 73 vs 71, a difference of 2 points across all benchmarks.

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

Grok 4.1 Fast leads in knowledge tasks with an average score of 91 vs 89.

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

Grok 4.1 Fast leads in coding with an average score of 86 vs 84.

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

Grok 4.1 Fast leads in math with an average score of 95 vs 93.

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

Grok 4.1 Fast leads in reasoning with an average score of 89 vs 87.

Related Comparisons

Grok 4.1 Fast vs GPT-5.4Grok 4.1 Fast vs Gemini 3.1 ProGrok 4.1 Fast vs Claude Opus 4.6Grok 4.1 Fast vs GPT-5.3 CodexGrok 4.1 Fast vs Grok 4.1Grok 4.1 Fast vs GPT-5.2