Grok 4.1 Fast vs o3

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 67 (6 point difference).Grok 4.1 Fast wins 4 out of 4 categories.

Knowledge

Grok 4.1 Fast

Grok 4.1 Fast

91

o3

85.3

94
MMLU
86
92
GPQA
87
90
SuperGPQA
85
88
OpenBookQA
83

Coding

Grok 4.1 Fast

Grok 4.1 Fast

86

o3

78

86
HumanEval
78

Mathematics

Grok 4.1 Fast

Grok 4.1 Fast

95

o3

87

96
AIME 2023
88
98
AIME 2024
90
97
AIME 2025
89
92
HMMT Feb 2023
84
94
HMMT Feb 2024
86
93
HMMT Feb 2025
85
95
BRUMO 2025
87

Reasoning

Grok 4.1 Fast

Grok 4.1 Fast

89

o3

83

90
SimpleQA
84
88
MuSR
82

Frequently Asked Questions

Which is better, Grok 4.1 Fast or o3?

Grok 4.1 Fast scores higher overall with 73 vs 67, a difference of 6 points across all benchmarks.

Which is better for knowledge tasks, Grok 4.1 Fast or o3?

Grok 4.1 Fast leads in knowledge tasks with an average score of 91 vs 85.3.

Which is better for coding, Grok 4.1 Fast or o3?

Grok 4.1 Fast leads in coding with an average score of 86 vs 78.

Which is better for math, Grok 4.1 Fast or o3?

Grok 4.1 Fast leads in math with an average score of 95 vs 87.

Which is better for reasoning, Grok 4.1 Fast or o3?

Grok 4.1 Fast leads in reasoning with an average score of 89 vs 83.