benchlm.ai

Claude 4 Sonnet vs Claude Haiku 4.5

Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.

Quick Verdict

Claude 4 Sonnet wins overall with a score of 59 vs 57 (2 point difference).Claude 4 Sonnet wins 4 out of 4 categories.

Claude 4 Sonnet

CreatorAnthropic
TypeProprietary
Context200K
Score59

Claude Haiku 4.5

CreatorAnthropic
TypeProprietary
Context200K
Score57

Knowledge

Claude 4 Sonnet

Claude 4 Sonnet

71.5

Claude Haiku 4.5

65.8

73
MMLU
68
73
GPQA
67
71
SuperGPQA
65
69
OpenBookQA
63

Coding

Claude 4 Sonnet

Claude 4 Sonnet

65

Claude Haiku 4.5

60

65
HumanEval
60

Mathematics

Claude 4 Sonnet

Claude 4 Sonnet

72

Claude Haiku 4.5

67

73
AIME 2023
68
75
AIME 2024
70
74
AIME 2025
69
69
HMMT Feb 2023
64
71
HMMT Feb 2024
66
70
HMMT Feb 2025
65
72
BRUMO 2025
67

Reasoning

Claude 4 Sonnet

Claude 4 Sonnet

70

Claude Haiku 4.5

64

71
SimpleQA
65
69
MuSR
63

Frequently Asked Questions

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

Claude 4 Sonnet scores higher overall with 59 vs 57, a difference of 2 points across all benchmarks.

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

Claude 4 Sonnet leads in knowledge tasks with an average score of 71.5 vs 65.8.

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

Claude 4 Sonnet leads in coding with an average score of 65 vs 60.

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

Claude 4 Sonnet leads in math with an average score of 72 vs 67.

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

Claude 4 Sonnet leads in reasoning with an average score of 70 vs 64.

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