benchlm.ai

Claude Haiku 4.5 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 57 (17 point difference).Claude Sonnet 4.5 wins 4 out of 4 categories.

Claude Haiku 4.5

CreatorAnthropic
TypeProprietary
Context200K
Score57

Claude Sonnet 4.5

CreatorAnthropic
TypeProprietary
Context1M
Score74

Knowledge

Claude Sonnet 4.5

Claude Haiku 4.5

65.8

Claude Sonnet 4.5

92

68
MMLU
95
67
GPQA
93
65
SuperGPQA
91
63
OpenBookQA
89

Coding

Claude Sonnet 4.5

Claude Haiku 4.5

60

Claude Sonnet 4.5

87

60
HumanEval
87

Mathematics

Claude Sonnet 4.5

Claude Haiku 4.5

67

Claude Sonnet 4.5

96

68
AIME 2023
97
70
AIME 2024
99
69
AIME 2025
98
64
HMMT Feb 2023
93
66
HMMT Feb 2024
95
65
HMMT Feb 2025
94
67
BRUMO 2025
96

Reasoning

Claude Sonnet 4.5

Claude Haiku 4.5

64

Claude Sonnet 4.5

90

65
SimpleQA
91
63
MuSR
89

Frequently Asked Questions

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

Claude Sonnet 4.5 scores higher overall with 74 vs 57, a difference of 17 points across all benchmarks.

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

Claude Sonnet 4.5 leads in knowledge tasks with an average score of 92 vs 65.8.

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

Claude Sonnet 4.5 leads in coding with an average score of 87 vs 60.

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

Claude Sonnet 4.5 leads in math with an average score of 96 vs 67.

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

Claude Sonnet 4.5 leads in reasoning with an average score of 90 vs 64.

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