benchlm.ai

Claude Sonnet 4.5 vs Z-1

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 43 (31 point difference).Claude Sonnet 4.5 wins 4 out of 4 categories.

Claude Sonnet 4.5

CreatorAnthropic
TypeProprietary
Context1M
Score74

Z-1

CreatorZ
TypeProprietary
Context128K
Score43

Knowledge

Claude Sonnet 4.5

Claude Sonnet 4.5

92

Z-1

49.8

95
MMLU
52
93
GPQA
51
91
SuperGPQA
49
89
OpenBookQA
47

Coding

Claude Sonnet 4.5

Claude Sonnet 4.5

87

Z-1

44

87
HumanEval
44

Mathematics

Claude Sonnet 4.5

Claude Sonnet 4.5

96

Z-1

51

97
AIME 2023
52
99
AIME 2024
54
98
AIME 2025
53
93
HMMT Feb 2023
48
95
HMMT Feb 2024
50
94
HMMT Feb 2025
49
96
BRUMO 2025
51

Reasoning

Claude Sonnet 4.5

Claude Sonnet 4.5

90

Z-1

49

91
SimpleQA
50
89
MuSR
48

Frequently Asked Questions

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

Claude Sonnet 4.5 scores higher overall with 74 vs 43, a difference of 31 points across all benchmarks.

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

Claude Sonnet 4.5 leads in knowledge tasks with an average score of 92 vs 49.8.

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

Claude Sonnet 4.5 leads in coding with an average score of 87 vs 44.

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

Claude Sonnet 4.5 leads in math with an average score of 96 vs 51.

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

Claude Sonnet 4.5 leads in reasoning with an average score of 90 vs 49.

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