Llama 3.1 405B 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 58 (10 point difference).o3-pro wins 4 out of 4 categories.

Knowledge

o3-pro

Llama 3.1 405B

68.5

o3-pro

87.3

70
MMLU
88
70
GPQA
89
68
SuperGPQA
87
66
OpenBookQA
85

Coding

o3-pro

Llama 3.1 405B

62

o3-pro

80

62
HumanEval
80

Mathematics

o3-pro

Llama 3.1 405B

69

o3-pro

89

70
AIME 2023
90
72
AIME 2024
92
71
AIME 2025
91
66
HMMT Feb 2023
86
68
HMMT Feb 2024
88
67
HMMT Feb 2025
87
69
BRUMO 2025
89

Reasoning

o3-pro

Llama 3.1 405B

67

o3-pro

85

68
SimpleQA
86
66
MuSR
84

Frequently Asked Questions

Which is better, Llama 3.1 405B or o3-pro?

o3-pro scores higher overall with 68 vs 58, a difference of 10 points across all benchmarks.

Which is better for knowledge tasks, Llama 3.1 405B or o3-pro?

o3-pro leads in knowledge tasks with an average score of 87.3 vs 68.5.

Which is better for coding, Llama 3.1 405B or o3-pro?

o3-pro leads in coding with an average score of 80 vs 62.

Which is better for math, Llama 3.1 405B or o3-pro?

o3-pro leads in math with an average score of 89 vs 69.

Which is better for reasoning, Llama 3.1 405B or o3-pro?

o3-pro leads in reasoning with an average score of 85 vs 67.