Claude 3 Haiku vs o3

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

Quick Verdict

o3 wins overall with a score of 67 vs 46 (21 point difference).o3 wins 4 out of 4 categories.

Knowledge

o3

Claude 3 Haiku

54.5

o3

85.3

56
MMLU
86
56
GPQA
87
54
SuperGPQA
85
52
OpenBookQA
83

Coding

o3

Claude 3 Haiku

48

o3

78

48
HumanEval
78

Mathematics

o3

Claude 3 Haiku

55

o3

87

56
AIME 2023
88
58
AIME 2024
90
57
AIME 2025
89
52
HMMT Feb 2023
84
54
HMMT Feb 2024
86
53
HMMT Feb 2025
85
55
BRUMO 2025
87

Reasoning

o3

Claude 3 Haiku

53

o3

83

54
SimpleQA
84
52
MuSR
82

Frequently Asked Questions

Which is better, Claude 3 Haiku or o3?

o3 scores higher overall with 67 vs 46, a difference of 21 points across all benchmarks.

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

o3 leads in knowledge tasks with an average score of 85.3 vs 54.5.

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

o3 leads in coding with an average score of 78 vs 48.

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

o3 leads in math with an average score of 87 vs 55.

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

o3 leads in reasoning with an average score of 83 vs 53.