benchlm.ai

Claude Opus 4.5 vs Llama 3.1 405B

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

Quick Verdict

Claude Opus 4.5 wins overall with a score of 79 vs 58 (21 point difference).Claude Opus 4.5 wins 4 out of 4 categories.

Claude Opus 4.5

CreatorAnthropic
TypeProprietary
Context200K
Score79

Llama 3.1 405B

CreatorMeta
TypeOpen Weight
Context128K
Score58

Knowledge

Claude Opus 4.5

Claude Opus 4.5

96

Llama 3.1 405B

68.5

99
MMLU
70
97
GPQA
70
95
SuperGPQA
68
93
OpenBookQA
66

Coding

Claude Opus 4.5

Claude Opus 4.5

91

Llama 3.1 405B

62

91
HumanEval
62

Mathematics

Claude Opus 4.5

Claude Opus 4.5

97.1

Llama 3.1 405B

69

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

Reasoning

Claude Opus 4.5

Claude Opus 4.5

94

Llama 3.1 405B

67

95
SimpleQA
68
93
MuSR
66

Frequently Asked Questions

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

Claude Opus 4.5 scores higher overall with 79 vs 58, a difference of 21 points across all benchmarks.

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

Claude Opus 4.5 leads in knowledge tasks with an average score of 96 vs 68.5.

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

Claude Opus 4.5 leads in coding with an average score of 91 vs 62.

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

Claude Opus 4.5 leads in math with an average score of 97.1 vs 69.

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

Claude Opus 4.5 leads in reasoning with an average score of 94 vs 67.

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