benchlm.ai

Claude 3.5 Sonnet 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 55 (19 point difference).Claude Sonnet 4.5 wins 4 out of 4 categories.

Claude 3.5 Sonnet

CreatorAnthropic
TypeProprietary
Context200K
Score55

Claude Sonnet 4.5

CreatorAnthropic
TypeProprietary
Context1M
Score74

Knowledge

Claude Sonnet 4.5

Claude 3.5 Sonnet

63.5

Claude Sonnet 4.5

92

65
MMLU
95
65
GPQA
93
63
SuperGPQA
91
61
OpenBookQA
89

Coding

Claude Sonnet 4.5

Claude 3.5 Sonnet

57

Claude Sonnet 4.5

87

57
HumanEval
87

Mathematics

Claude Sonnet 4.5

Claude 3.5 Sonnet

64

Claude Sonnet 4.5

96

65
AIME 2023
97
67
AIME 2024
99
66
AIME 2025
98
61
HMMT Feb 2023
93
63
HMMT Feb 2024
95
62
HMMT Feb 2025
94
64
BRUMO 2025
96

Reasoning

Claude Sonnet 4.5

Claude 3.5 Sonnet

62

Claude Sonnet 4.5

90

63
SimpleQA
91
61
MuSR
89

Frequently Asked Questions

Which is better, Claude 3.5 Sonnet or Claude Sonnet 4.5?

Claude Sonnet 4.5 scores higher overall with 74 vs 55, a difference of 19 points across all benchmarks.

Which is better for knowledge tasks, Claude 3.5 Sonnet or Claude Sonnet 4.5?

Claude Sonnet 4.5 leads in knowledge tasks with an average score of 92 vs 63.5.

Which is better for coding, Claude 3.5 Sonnet or Claude Sonnet 4.5?

Claude Sonnet 4.5 leads in coding with an average score of 87 vs 57.

Which is better for math, Claude 3.5 Sonnet or Claude Sonnet 4.5?

Claude Sonnet 4.5 leads in math with an average score of 96 vs 64.

Which is better for reasoning, Claude 3.5 Sonnet or Claude Sonnet 4.5?

Claude Sonnet 4.5 leads in reasoning with an average score of 90 vs 62.

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