GPT-4o vs GPT-5.1

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

Quick Verdict

GPT-5.1 wins overall with a score of 76 vs 56 (20 point difference).GPT-5.1 wins 4 out of 4 categories.

Knowledge

GPT-5.1

GPT-4o

64.5

GPT-5.1

94

66
MMLU
97
66
GPQA
95
64
SuperGPQA
93
62
OpenBookQA
91

Coding

GPT-5.1

GPT-4o

58

GPT-5.1

89

58
HumanEval
89

Mathematics

GPT-5.1

GPT-4o

65

GPT-5.1

97.1

66
AIME 2023
99
68
AIME 2024
99
67
AIME 2025
98
62
HMMT Feb 2023
95
64
HMMT Feb 2024
97
63
HMMT Feb 2025
96
65
BRUMO 2025
96

Reasoning

GPT-5.1

GPT-4o

63

GPT-5.1

92

64
SimpleQA
93
62
MuSR
91

Frequently Asked Questions

Which is better, GPT-4o or GPT-5.1?

GPT-5.1 scores higher overall with 76 vs 56, a difference of 20 points across all benchmarks.

Which is better for knowledge tasks, GPT-4o or GPT-5.1?

GPT-5.1 leads in knowledge tasks with an average score of 94 vs 64.5.

Which is better for coding, GPT-4o or GPT-5.1?

GPT-5.1 leads in coding with an average score of 89 vs 58.

Which is better for math, GPT-4o or GPT-5.1?

GPT-5.1 leads in math with an average score of 97.1 vs 65.

Which is better for reasoning, GPT-4o or GPT-5.1?

GPT-5.1 leads in reasoning with an average score of 92 vs 63.