Llama 3.1 405B vs Llama 4 Behemoth

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

Quick Verdict

Llama 3.1 405B wins overall with a score of 58 vs 39 (19 point difference).Llama 3.1 405B wins 4 out of 4 categories.

Knowledge

Llama 3.1 405B

Llama 3.1 405B

68.5

Llama 4 Behemoth

45.8

70
MMLU
48
70
GPQA
47
68
SuperGPQA
45
66
OpenBookQA
43

Coding

Llama 3.1 405B

Llama 3.1 405B

62

Llama 4 Behemoth

40

62
HumanEval
40

Mathematics

Llama 3.1 405B

Llama 3.1 405B

69

Llama 4 Behemoth

47

70
AIME 2023
48
72
AIME 2024
50
71
AIME 2025
49
66
HMMT Feb 2023
44
68
HMMT Feb 2024
46
67
HMMT Feb 2025
45
69
BRUMO 2025
47

Reasoning

Llama 3.1 405B

Llama 3.1 405B

67

Llama 4 Behemoth

45

68
SimpleQA
46
66
MuSR
44

Frequently Asked Questions

Which is better, Llama 3.1 405B or Llama 4 Behemoth?

Llama 3.1 405B scores higher overall with 58 vs 39, a difference of 19 points across all benchmarks.

Which is better for knowledge tasks, Llama 3.1 405B or Llama 4 Behemoth?

Llama 3.1 405B leads in knowledge tasks with an average score of 68.5 vs 45.8.

Which is better for coding, Llama 3.1 405B or Llama 4 Behemoth?

Llama 3.1 405B leads in coding with an average score of 62 vs 40.

Which is better for math, Llama 3.1 405B or Llama 4 Behemoth?

Llama 3.1 405B leads in math with an average score of 69 vs 47.

Which is better for reasoning, Llama 3.1 405B or Llama 4 Behemoth?

Llama 3.1 405B leads in reasoning with an average score of 67 vs 45.