benchlm.ai

Claude Haiku 4.5 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 57 (22 point difference).Claude Opus 4.5 wins 4 out of 4 categories.

Claude Haiku 4.5

CreatorAnthropic
TypeProprietary
Context200K
Score57

Claude Opus 4.5

CreatorAnthropic
TypeProprietary
Context200K
Score79

Knowledge

Claude Opus 4.5

Claude Haiku 4.5

65.8

Claude Opus 4.5

96

68
MMLU
99
67
GPQA
97
65
SuperGPQA
95
63
OpenBookQA
93

Coding

Claude Opus 4.5

Claude Haiku 4.5

60

Claude Opus 4.5

91

60
HumanEval
91

Mathematics

Claude Opus 4.5

Claude Haiku 4.5

67

Claude Opus 4.5

97.1

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

Reasoning

Claude Opus 4.5

Claude Haiku 4.5

64

Claude Opus 4.5

94

65
SimpleQA
95
63
MuSR
93

Frequently Asked Questions

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

Claude Opus 4.5 scores higher overall with 79 vs 57, a difference of 22 points across all benchmarks.

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

Claude Opus 4.5 leads in knowledge tasks with an average score of 96 vs 65.8.

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

Claude Opus 4.5 leads in coding with an average score of 91 vs 60.

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

Claude Opus 4.5 leads in math with an average score of 97.1 vs 67.

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

Claude Opus 4.5 leads in reasoning with an average score of 94 vs 64.

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