benchlm.ai

GPT-5 (medium) vs o3

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

Quick Verdict

GPT-5 (medium) wins overall with a score of 70 vs 67 (3 point difference).GPT-5 (medium) wins 4 out of 4 categories.

GPT-5 (medium)

CreatorOpenAI
TypeProprietary
Context128K
Score70

o3

CreatorOpenAI
TypeProprietary
Context200K
Score67

Knowledge

GPT-5 (medium)

GPT-5 (medium)

88

o3

85.3

91
MMLU
86
89
GPQA
87
87
SuperGPQA
85
85
OpenBookQA
83

Coding

GPT-5 (medium)

GPT-5 (medium)

83

o3

78

83
HumanEval
78

Mathematics

GPT-5 (medium)

GPT-5 (medium)

92

o3

87

93
AIME 2023
88
95
AIME 2024
90
94
AIME 2025
89
89
HMMT Feb 2023
84
91
HMMT Feb 2024
86
90
HMMT Feb 2025
85
92
BRUMO 2025
87

Reasoning

GPT-5 (medium)

GPT-5 (medium)

86

o3

83

87
SimpleQA
84
85
MuSR
82

Frequently Asked Questions

Which is better, GPT-5 (medium) or o3?

GPT-5 (medium) scores higher overall with 70 vs 67, a difference of 3 points across all benchmarks.

Which is better for knowledge tasks, GPT-5 (medium) or o3?

GPT-5 (medium) leads in knowledge tasks with an average score of 88 vs 85.3.

Which is better for coding, GPT-5 (medium) or o3?

GPT-5 (medium) leads in coding with an average score of 83 vs 78.

Which is better for math, GPT-5 (medium) or o3?

GPT-5 (medium) leads in math with an average score of 92 vs 87.

Which is better for reasoning, GPT-5 (medium) or o3?

GPT-5 (medium) leads in reasoning with an average score of 86 vs 83.

Related Comparisons

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