benchlm.ai

Claude Sonnet 4.5 vs GPT-4o

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 56 (18 point difference).Claude Sonnet 4.5 wins 4 out of 4 categories.

Claude Sonnet 4.5

CreatorAnthropic
TypeProprietary
Context1M
Score74

GPT-4o

CreatorOpenAI
TypeProprietary
Context128K
Score56

Knowledge

Claude Sonnet 4.5

Claude Sonnet 4.5

92

GPT-4o

64.5

95
MMLU
66
93
GPQA
66
91
SuperGPQA
64
89
OpenBookQA
62

Coding

Claude Sonnet 4.5

Claude Sonnet 4.5

87

GPT-4o

58

87
HumanEval
58

Mathematics

Claude Sonnet 4.5

Claude Sonnet 4.5

96

GPT-4o

65

97
AIME 2023
66
99
AIME 2024
68
98
AIME 2025
67
93
HMMT Feb 2023
62
95
HMMT Feb 2024
64
94
HMMT Feb 2025
63
96
BRUMO 2025
65

Reasoning

Claude Sonnet 4.5

Claude Sonnet 4.5

90

GPT-4o

63

91
SimpleQA
64
89
MuSR
62

Frequently Asked Questions

Which is better, Claude Sonnet 4.5 or GPT-4o?

Claude Sonnet 4.5 scores higher overall with 74 vs 56, a difference of 18 points across all benchmarks.

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

Claude Sonnet 4.5 leads in knowledge tasks with an average score of 92 vs 64.5.

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

Claude Sonnet 4.5 leads in coding with an average score of 87 vs 58.

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

Claude Sonnet 4.5 leads in math with an average score of 96 vs 65.

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

Claude Sonnet 4.5 leads in reasoning with an average score of 90 vs 63.

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