benchlm.ai

Grok 4.1 Fast vs Llama 3.1 405B

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 58 (15 point difference).Grok 4.1 Fast wins 4 out of 4 categories.

Grok 4.1 Fast

CreatorxAI
TypeProprietary
Context2M
Score73

Llama 3.1 405B

CreatorMeta
TypeOpen Weight
Context128K
Score58

Knowledge

Grok 4.1 Fast

Grok 4.1 Fast

91

Llama 3.1 405B

68.5

94
MMLU
70
92
GPQA
70
90
SuperGPQA
68
88
OpenBookQA
66

Coding

Grok 4.1 Fast

Grok 4.1 Fast

86

Llama 3.1 405B

62

86
HumanEval
62

Mathematics

Grok 4.1 Fast

Grok 4.1 Fast

95

Llama 3.1 405B

69

96
AIME 2023
70
98
AIME 2024
72
97
AIME 2025
71
92
HMMT Feb 2023
66
94
HMMT Feb 2024
68
93
HMMT Feb 2025
67
95
BRUMO 2025
69

Reasoning

Grok 4.1 Fast

Grok 4.1 Fast

89

Llama 3.1 405B

67

90
SimpleQA
68
88
MuSR
66

Frequently Asked Questions

Which is better, Grok 4.1 Fast or Llama 3.1 405B?

Grok 4.1 Fast scores higher overall with 73 vs 58, a difference of 15 points across all benchmarks.

Which is better for knowledge tasks, Grok 4.1 Fast or Llama 3.1 405B?

Grok 4.1 Fast leads in knowledge tasks with an average score of 91 vs 68.5.

Which is better for coding, Grok 4.1 Fast or Llama 3.1 405B?

Grok 4.1 Fast leads in coding with an average score of 86 vs 62.

Which is better for math, Grok 4.1 Fast or Llama 3.1 405B?

Grok 4.1 Fast leads in math with an average score of 95 vs 69.

Which is better for reasoning, Grok 4.1 Fast or Llama 3.1 405B?

Grok 4.1 Fast leads in reasoning with an average score of 89 vs 67.

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