GPT-5.1 vs Grok 4.1 Fast

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

Quick Verdict

GPT-5.1 wins overall with a score of 76 vs 73 (3 point difference).GPT-5.1 wins 4 out of 4 categories.

Knowledge

GPT-5.1

GPT-5.1

94

Grok 4.1 Fast

91

97
MMLU
94
95
GPQA
92
93
SuperGPQA
90
91
OpenBookQA
88

Coding

GPT-5.1

GPT-5.1

89

Grok 4.1 Fast

86

89
HumanEval
86

Mathematics

GPT-5.1

GPT-5.1

97.1

Grok 4.1 Fast

95

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

Reasoning

GPT-5.1

GPT-5.1

92

Grok 4.1 Fast

89

93
SimpleQA
90
91
MuSR
88

Frequently Asked Questions

Which is better, GPT-5.1 or Grok 4.1 Fast?

GPT-5.1 scores higher overall with 76 vs 73, a difference of 3 points across all benchmarks.

Which is better for knowledge tasks, GPT-5.1 or Grok 4.1 Fast?

GPT-5.1 leads in knowledge tasks with an average score of 94 vs 91.

Which is better for coding, GPT-5.1 or Grok 4.1 Fast?

GPT-5.1 leads in coding with an average score of 89 vs 86.

Which is better for math, GPT-5.1 or Grok 4.1 Fast?

GPT-5.1 leads in math with an average score of 97.1 vs 95.

Which is better for reasoning, GPT-5.1 or Grok 4.1 Fast?

GPT-5.1 leads in reasoning with an average score of 92 vs 89.