benchlm.ai

Claude 4 Sonnet vs Claude Opus 4.5

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 59 (20 point difference).Claude Opus 4.5 wins 4 out of 4 categories.

Claude 4 Sonnet

CreatorAnthropic
TypeProprietary
Context200K
Score59

Claude Opus 4.5

CreatorAnthropic
TypeProprietary
Context200K
Score79

Knowledge

Claude Opus 4.5

Claude 4 Sonnet

71.5

Claude Opus 4.5

96

73
MMLU
99
73
GPQA
97
71
SuperGPQA
95
69
OpenBookQA
93

Coding

Claude Opus 4.5

Claude 4 Sonnet

65

Claude Opus 4.5

91

65
HumanEval
91

Mathematics

Claude Opus 4.5

Claude 4 Sonnet

72

Claude Opus 4.5

97.1

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

Reasoning

Claude Opus 4.5

Claude 4 Sonnet

70

Claude Opus 4.5

94

71
SimpleQA
95
69
MuSR
93

Frequently Asked Questions

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

Claude Opus 4.5 scores higher overall with 79 vs 59, a difference of 20 points across all benchmarks.

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

Claude Opus 4.5 leads in knowledge tasks with an average score of 96 vs 71.5.

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

Claude Opus 4.5 leads in coding with an average score of 91 vs 65.

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

Claude Opus 4.5 leads in math with an average score of 97.1 vs 72.

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

Claude Opus 4.5 leads in reasoning with an average score of 94 vs 70.

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