GPT-5 (high) vs Llama 3.1 405B

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

Quick Verdict

GPT-5 (high) wins overall with a score of 72 vs 58 (14 point difference).GPT-5 (high) wins 4 out of 4 categories.

Knowledge

GPT-5 (high)

GPT-5 (high)

90

Llama 3.1 405B

68.5

93
MMLU
70
91
GPQA
70
89
SuperGPQA
68
87
OpenBookQA
66

Coding

GPT-5 (high)

GPT-5 (high)

85

Llama 3.1 405B

62

85
HumanEval
62

Mathematics

GPT-5 (high)

GPT-5 (high)

94

Llama 3.1 405B

69

95
AIME 2023
70
97
AIME 2024
72
96
AIME 2025
71
91
HMMT Feb 2023
66
93
HMMT Feb 2024
68
92
HMMT Feb 2025
67
94
BRUMO 2025
69

Reasoning

GPT-5 (high)

GPT-5 (high)

88

Llama 3.1 405B

67

89
SimpleQA
68
87
MuSR
66

Frequently Asked Questions

Which is better, GPT-5 (high) or Llama 3.1 405B?

GPT-5 (high) scores higher overall with 72 vs 58, a difference of 14 points across all benchmarks.

Which is better for knowledge tasks, GPT-5 (high) or Llama 3.1 405B?

GPT-5 (high) leads in knowledge tasks with an average score of 90 vs 68.5.

Which is better for coding, GPT-5 (high) or Llama 3.1 405B?

GPT-5 (high) leads in coding with an average score of 85 vs 62.

Which is better for math, GPT-5 (high) or Llama 3.1 405B?

GPT-5 (high) leads in math with an average score of 94 vs 69.

Which is better for reasoning, GPT-5 (high) or Llama 3.1 405B?

GPT-5 (high) leads in reasoning with an average score of 88 vs 67.