benchlm.ai

Claude 4 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 59 (15 point difference).Claude Sonnet 4.5 wins 4 out of 4 categories.

Claude 4 Sonnet

CreatorAnthropic
TypeProprietary
Context200K
Score59

Claude Sonnet 4.5

CreatorAnthropic
TypeProprietary
Context1M
Score74

Knowledge

Claude Sonnet 4.5

Claude 4 Sonnet

71.5

Claude Sonnet 4.5

92

73
MMLU
95
73
GPQA
93
71
SuperGPQA
91
69
OpenBookQA
89

Coding

Claude Sonnet 4.5

Claude 4 Sonnet

65

Claude Sonnet 4.5

87

65
HumanEval
87

Mathematics

Claude Sonnet 4.5

Claude 4 Sonnet

72

Claude Sonnet 4.5

96

73
AIME 2023
97
75
AIME 2024
99
74
AIME 2025
98
69
HMMT Feb 2023
93
71
HMMT Feb 2024
95
70
HMMT Feb 2025
94
72
BRUMO 2025
96

Reasoning

Claude Sonnet 4.5

Claude 4 Sonnet

70

Claude Sonnet 4.5

90

71
SimpleQA
91
69
MuSR
89

Frequently Asked Questions

Which is better, Claude 4 Sonnet or Claude Sonnet 4.5?

Claude Sonnet 4.5 scores higher overall with 74 vs 59, a difference of 15 points across all benchmarks.

Which is better for knowledge tasks, Claude 4 Sonnet or Claude Sonnet 4.5?

Claude Sonnet 4.5 leads in knowledge tasks with an average score of 92 vs 71.5.

Which is better for coding, Claude 4 Sonnet or Claude Sonnet 4.5?

Claude Sonnet 4.5 leads in coding with an average score of 87 vs 65.

Which is better for math, Claude 4 Sonnet or Claude Sonnet 4.5?

Claude Sonnet 4.5 leads in math with an average score of 96 vs 72.

Which is better for reasoning, Claude 4 Sonnet or Claude Sonnet 4.5?

Claude Sonnet 4.5 leads in reasoning with an average score of 90 vs 70.

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