benchlm.ai

Claude Sonnet 4.5 vs Llama 3.1 405B

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

Quick Verdict

Claude Sonnet 4.5 wins overall with a score of 74 vs 58 (16 point difference).Claude Sonnet 4.5 wins 4 out of 4 categories.

Claude Sonnet 4.5

CreatorAnthropic
TypeProprietary
Context1M
Score74

Llama 3.1 405B

CreatorMeta
TypeOpen Weight
Context128K
Score58

Knowledge

Claude Sonnet 4.5

Claude Sonnet 4.5

92

Llama 3.1 405B

68.5

95
MMLU
70
93
GPQA
70
91
SuperGPQA
68
89
OpenBookQA
66

Coding

Claude Sonnet 4.5

Claude Sonnet 4.5

87

Llama 3.1 405B

62

87
HumanEval
62

Mathematics

Claude Sonnet 4.5

Claude Sonnet 4.5

96

Llama 3.1 405B

69

97
AIME 2023
70
99
AIME 2024
72
98
AIME 2025
71
93
HMMT Feb 2023
66
95
HMMT Feb 2024
68
94
HMMT Feb 2025
67
96
BRUMO 2025
69

Reasoning

Claude Sonnet 4.5

Claude Sonnet 4.5

90

Llama 3.1 405B

67

91
SimpleQA
68
89
MuSR
66

Frequently Asked Questions

Which is better, Claude Sonnet 4.5 or Llama 3.1 405B?

Claude Sonnet 4.5 scores higher overall with 74 vs 58, a difference of 16 points across all benchmarks.

Which is better for knowledge tasks, Claude Sonnet 4.5 or Llama 3.1 405B?

Claude Sonnet 4.5 leads in knowledge tasks with an average score of 92 vs 68.5.

Which is better for coding, Claude Sonnet 4.5 or Llama 3.1 405B?

Claude Sonnet 4.5 leads in coding with an average score of 87 vs 62.

Which is better for math, Claude Sonnet 4.5 or Llama 3.1 405B?

Claude Sonnet 4.5 leads in math with an average score of 96 vs 69.

Which is better for reasoning, Claude Sonnet 4.5 or Llama 3.1 405B?

Claude Sonnet 4.5 leads in reasoning with an average score of 90 vs 67.

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