benchlm.ai

GPT-5.1 vs o1-preview

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

Quick Verdict

GPT-5.1 wins overall with a score of 76 vs 71 (5 point difference).GPT-5.1 wins 4 out of 4 categories.

GPT-5.1

CreatorOpenAI
TypeProprietary
Context400K
Score76

o1-preview

CreatorOpenAI
TypeProprietary
Context200K
Score71

Knowledge

GPT-5.1

GPT-5.1

94

o1-preview

89

97
MMLU
92
95
GPQA
90
93
SuperGPQA
88
91
OpenBookQA
86

Coding

GPT-5.1

GPT-5.1

89

o1-preview

86

89
HumanEval
86

Mathematics

GPT-5.1

GPT-5.1

97.1

o1-preview

93

99
AIME 2023
94
99
AIME 2024
96
98
AIME 2025
95
95
HMMT Feb 2023
90
97
HMMT Feb 2024
92
96
HMMT Feb 2025
91
96
BRUMO 2025
93

Reasoning

GPT-5.1

GPT-5.1

92

o1-preview

87

93
SimpleQA
88
91
MuSR
86

Frequently Asked Questions

Which is better, GPT-5.1 or o1-preview?

GPT-5.1 scores higher overall with 76 vs 71, a difference of 5 points across all benchmarks.

Which is better for knowledge tasks, GPT-5.1 or o1-preview?

GPT-5.1 leads in knowledge tasks with an average score of 94 vs 89.

Which is better for coding, GPT-5.1 or o1-preview?

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

Which is better for math, GPT-5.1 or o1-preview?

GPT-5.1 leads in math with an average score of 97.1 vs 93.

Which is better for reasoning, GPT-5.1 or o1-preview?

GPT-5.1 leads in reasoning with an average score of 92 vs 87.

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