Claude 3.5 Sonnet vs o3-pro

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

Quick Verdict

o3-pro wins overall with a score of 68 vs 55 (13 point difference).o3-pro wins 4 out of 4 categories.

Knowledge

o3-pro

Claude 3.5 Sonnet

63.5

o3-pro

87.3

65
MMLU
88
65
GPQA
89
63
SuperGPQA
87
61
OpenBookQA
85

Coding

o3-pro

Claude 3.5 Sonnet

57

o3-pro

80

57
HumanEval
80

Mathematics

o3-pro

Claude 3.5 Sonnet

64

o3-pro

89

65
AIME 2023
90
67
AIME 2024
92
66
AIME 2025
91
61
HMMT Feb 2023
86
63
HMMT Feb 2024
88
62
HMMT Feb 2025
87
64
BRUMO 2025
89

Reasoning

o3-pro

Claude 3.5 Sonnet

62

o3-pro

85

63
SimpleQA
86
61
MuSR
84

Frequently Asked Questions

Which is better, Claude 3.5 Sonnet or o3-pro?

o3-pro scores higher overall with 68 vs 55, a difference of 13 points across all benchmarks.

Which is better for knowledge tasks, Claude 3.5 Sonnet or o3-pro?

o3-pro leads in knowledge tasks with an average score of 87.3 vs 63.5.

Which is better for coding, Claude 3.5 Sonnet or o3-pro?

o3-pro leads in coding with an average score of 80 vs 57.

Which is better for math, Claude 3.5 Sonnet or o3-pro?

o3-pro leads in math with an average score of 89 vs 64.

Which is better for reasoning, Claude 3.5 Sonnet or o3-pro?

o3-pro leads in reasoning with an average score of 85 vs 62.