benchlm.ai

Claude Opus 4.5 vs Z-1

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 43 (36 point difference).Claude Opus 4.5 wins 4 out of 4 categories.

Claude Opus 4.5

CreatorAnthropic
TypeProprietary
Context200K
Score79

Z-1

CreatorZ
TypeProprietary
Context128K
Score43

Knowledge

Claude Opus 4.5

Claude Opus 4.5

96

Z-1

49.8

99
MMLU
52
97
GPQA
51
95
SuperGPQA
49
93
OpenBookQA
47

Coding

Claude Opus 4.5

Claude Opus 4.5

91

Z-1

44

91
HumanEval
44

Mathematics

Claude Opus 4.5

Claude Opus 4.5

97.1

Z-1

51

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

Reasoning

Claude Opus 4.5

Claude Opus 4.5

94

Z-1

49

95
SimpleQA
50
93
MuSR
48

Frequently Asked Questions

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

Claude Opus 4.5 scores higher overall with 79 vs 43, a difference of 36 points across all benchmarks.

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

Claude Opus 4.5 leads in knowledge tasks with an average score of 96 vs 49.8.

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

Claude Opus 4.5 leads in coding with an average score of 91 vs 44.

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

Claude Opus 4.5 leads in math with an average score of 97.1 vs 51.

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

Claude Opus 4.5 leads in reasoning with an average score of 94 vs 49.

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