Claude 3.5 Sonnet vs o3

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

Quick Verdict

o3 wins overall with a score of 67 vs 55 (12 point difference).o3 wins 4 out of 4 categories.

Knowledge

o3

Claude 3.5 Sonnet

63.5

o3

85.3

65
MMLU
86
65
GPQA
87
63
SuperGPQA
85
61
OpenBookQA
83

Coding

o3

Claude 3.5 Sonnet

57

o3

78

57
HumanEval
78

Mathematics

o3

Claude 3.5 Sonnet

64

o3

87

65
AIME 2023
88
67
AIME 2024
90
66
AIME 2025
89
61
HMMT Feb 2023
84
63
HMMT Feb 2024
86
62
HMMT Feb 2025
85
64
BRUMO 2025
87

Reasoning

o3

Claude 3.5 Sonnet

62

o3

83

63
SimpleQA
84
61
MuSR
82

Frequently Asked Questions

Which is better, Claude 3.5 Sonnet or o3?

o3 scores higher overall with 67 vs 55, a difference of 12 points across all benchmarks.

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

o3 leads in knowledge tasks with an average score of 85.3 vs 63.5.

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

o3 leads in coding with an average score of 78 vs 57.

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

o3 leads in math with an average score of 87 vs 64.

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

o3 leads in reasoning with an average score of 83 vs 62.