GPT-5.1 vs o3-pro

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

Quick Verdict

GPT-5.1 wins overall with a score of 76 vs 68 (8 point difference).GPT-5.1 wins 4 out of 4 categories.

Knowledge

GPT-5.1

GPT-5.1

94

o3-pro

87.3

97
MMLU
88
95
GPQA
89
93
SuperGPQA
87
91
OpenBookQA
85

Coding

GPT-5.1

GPT-5.1

89

o3-pro

80

89
HumanEval
80

Mathematics

GPT-5.1

GPT-5.1

97.1

o3-pro

89

99
AIME 2023
90
99
AIME 2024
92
98
AIME 2025
91
95
HMMT Feb 2023
86
97
HMMT Feb 2024
88
96
HMMT Feb 2025
87
96
BRUMO 2025
89

Reasoning

GPT-5.1

GPT-5.1

92

o3-pro

85

93
SimpleQA
86
91
MuSR
84

Frequently Asked Questions

Which is better, GPT-5.1 or o3-pro?

GPT-5.1 scores higher overall with 76 vs 68, a difference of 8 points across all benchmarks.

Which is better for knowledge tasks, GPT-5.1 or o3-pro?

GPT-5.1 leads in knowledge tasks with an average score of 94 vs 87.3.

Which is better for coding, GPT-5.1 or o3-pro?

GPT-5.1 leads in coding with an average score of 89 vs 80.

Which is better for math, GPT-5.1 or o3-pro?

GPT-5.1 leads in math with an average score of 97.1 vs 89.

Which is better for reasoning, GPT-5.1 or o3-pro?

GPT-5.1 leads in reasoning with an average score of 92 vs 85.