Claude 3 Opus vs o3

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

Quick Verdict

o3 wins overall with a score of 67 vs 51 (16 point difference).o3 wins 4 out of 4 categories.

Knowledge

o3

Claude 3 Opus

59.5

o3

85.3

61
MMLU
86
61
GPQA
87
59
SuperGPQA
85
57
OpenBookQA
83

Coding

o3

Claude 3 Opus

53

o3

78

53
HumanEval
78

Mathematics

o3

Claude 3 Opus

60

o3

87

61
AIME 2023
88
63
AIME 2024
90
62
AIME 2025
89
57
HMMT Feb 2023
84
59
HMMT Feb 2024
86
58
HMMT Feb 2025
85
60
BRUMO 2025
87

Reasoning

o3

Claude 3 Opus

58

o3

83

59
SimpleQA
84
57
MuSR
82

Frequently Asked Questions

Which is better, Claude 3 Opus or o3?

o3 scores higher overall with 67 vs 51, a difference of 16 points across all benchmarks.

Which is better for knowledge tasks, Claude 3 Opus or o3?

o3 leads in knowledge tasks with an average score of 85.3 vs 59.5.

Which is better for coding, Claude 3 Opus or o3?

o3 leads in coding with an average score of 78 vs 53.

Which is better for math, Claude 3 Opus or o3?

o3 leads in math with an average score of 87 vs 60.

Which is better for reasoning, Claude 3 Opus or o3?

o3 leads in reasoning with an average score of 83 vs 58.