benchlm.ai

Claude Haiku 4.5 vs Z-1

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

Quick Verdict

Claude Haiku 4.5 wins overall with a score of 57 vs 43 (14 point difference).Claude Haiku 4.5 wins 4 out of 4 categories.

Claude Haiku 4.5

CreatorAnthropic
TypeProprietary
Context200K
Score57

Z-1

CreatorZ
TypeProprietary
Context128K
Score43

Knowledge

Claude Haiku 4.5

Claude Haiku 4.5

65.8

Z-1

49.8

68
MMLU
52
67
GPQA
51
65
SuperGPQA
49
63
OpenBookQA
47

Coding

Claude Haiku 4.5

Claude Haiku 4.5

60

Z-1

44

60
HumanEval
44

Mathematics

Claude Haiku 4.5

Claude Haiku 4.5

67

Z-1

51

68
AIME 2023
52
70
AIME 2024
54
69
AIME 2025
53
64
HMMT Feb 2023
48
66
HMMT Feb 2024
50
65
HMMT Feb 2025
49
67
BRUMO 2025
51

Reasoning

Claude Haiku 4.5

Claude Haiku 4.5

64

Z-1

49

65
SimpleQA
50
63
MuSR
48

Frequently Asked Questions

Which is better, Claude Haiku 4.5 or Z-1?

Claude Haiku 4.5 scores higher overall with 57 vs 43, a difference of 14 points across all benchmarks.

Which is better for knowledge tasks, Claude Haiku 4.5 or Z-1?

Claude Haiku 4.5 leads in knowledge tasks with an average score of 65.8 vs 49.8.

Which is better for coding, Claude Haiku 4.5 or Z-1?

Claude Haiku 4.5 leads in coding with an average score of 60 vs 44.

Which is better for math, Claude Haiku 4.5 or Z-1?

Claude Haiku 4.5 leads in math with an average score of 67 vs 51.

Which is better for reasoning, Claude Haiku 4.5 or Z-1?

Claude Haiku 4.5 leads in reasoning with an average score of 64 vs 49.

Related Comparisons

Claude Haiku 4.5 vs GPT-5.4Claude Haiku 4.5 vs Gemini 3.1 ProClaude Haiku 4.5 vs Claude Opus 4.6Claude Haiku 4.5 vs GPT-5.3 CodexClaude Haiku 4.5 vs Grok 4.1Claude Haiku 4.5 vs GPT-5.2