benchlm.ai

Claude 3 Opus vs Claude Sonnet 4.5

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 51 (23 point difference).Claude Sonnet 4.5 wins 4 out of 4 categories.

Claude 3 Opus

CreatorAnthropic
TypeProprietary
Context200K
Score51

Claude Sonnet 4.5

CreatorAnthropic
TypeProprietary
Context1M
Score74

Knowledge

Claude Sonnet 4.5

Claude 3 Opus

59.5

Claude Sonnet 4.5

92

61
MMLU
95
61
GPQA
93
59
SuperGPQA
91
57
OpenBookQA
89

Coding

Claude Sonnet 4.5

Claude 3 Opus

53

Claude Sonnet 4.5

87

53
HumanEval
87

Mathematics

Claude Sonnet 4.5

Claude 3 Opus

60

Claude Sonnet 4.5

96

61
AIME 2023
97
63
AIME 2024
99
62
AIME 2025
98
57
HMMT Feb 2023
93
59
HMMT Feb 2024
95
58
HMMT Feb 2025
94
60
BRUMO 2025
96

Reasoning

Claude Sonnet 4.5

Claude 3 Opus

58

Claude Sonnet 4.5

90

59
SimpleQA
91
57
MuSR
89

Frequently Asked Questions

Which is better, Claude 3 Opus or Claude Sonnet 4.5?

Claude Sonnet 4.5 scores higher overall with 74 vs 51, a difference of 23 points across all benchmarks.

Which is better for knowledge tasks, Claude 3 Opus or Claude Sonnet 4.5?

Claude Sonnet 4.5 leads in knowledge tasks with an average score of 92 vs 59.5.

Which is better for coding, Claude 3 Opus or Claude Sonnet 4.5?

Claude Sonnet 4.5 leads in coding with an average score of 87 vs 53.

Which is better for math, Claude 3 Opus or Claude Sonnet 4.5?

Claude Sonnet 4.5 leads in math with an average score of 96 vs 60.

Which is better for reasoning, Claude 3 Opus or Claude Sonnet 4.5?

Claude Sonnet 4.5 leads in reasoning with an average score of 90 vs 58.

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