benchlm.ai

Claude Haiku 4.5 vs GPT-5 (high)

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

Quick Verdict

GPT-5 (high) wins overall with a score of 72 vs 57 (15 point difference).GPT-5 (high) wins 4 out of 4 categories.

Claude Haiku 4.5

CreatorAnthropic
TypeProprietary
Context200K
Score57

GPT-5 (high)

CreatorOpenAI
TypeProprietary
Context128K
Score72

Knowledge

GPT-5 (high)

Claude Haiku 4.5

65.8

GPT-5 (high)

90

68
MMLU
93
67
GPQA
91
65
SuperGPQA
89
63
OpenBookQA
87

Coding

GPT-5 (high)

Claude Haiku 4.5

60

GPT-5 (high)

85

60
HumanEval
85

Mathematics

GPT-5 (high)

Claude Haiku 4.5

67

GPT-5 (high)

94

68
AIME 2023
95
70
AIME 2024
97
69
AIME 2025
96
64
HMMT Feb 2023
91
66
HMMT Feb 2024
93
65
HMMT Feb 2025
92
67
BRUMO 2025
94

Reasoning

GPT-5 (high)

Claude Haiku 4.5

64

GPT-5 (high)

88

65
SimpleQA
89
63
MuSR
87

Frequently Asked Questions

Which is better, Claude Haiku 4.5 or GPT-5 (high)?

GPT-5 (high) scores higher overall with 72 vs 57, a difference of 15 points across all benchmarks.

Which is better for knowledge tasks, Claude Haiku 4.5 or GPT-5 (high)?

GPT-5 (high) leads in knowledge tasks with an average score of 90 vs 65.8.

Which is better for coding, Claude Haiku 4.5 or GPT-5 (high)?

GPT-5 (high) leads in coding with an average score of 85 vs 60.

Which is better for math, Claude Haiku 4.5 or GPT-5 (high)?

GPT-5 (high) leads in math with an average score of 94 vs 67.

Which is better for reasoning, Claude Haiku 4.5 or GPT-5 (high)?

GPT-5 (high) leads in reasoning with an average score of 88 vs 64.

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