benchlm.ai

GPT-5 (medium) vs Z-1

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

Quick Verdict

GPT-5 (medium) wins overall with a score of 70 vs 43 (27 point difference).GPT-5 (medium) wins 4 out of 4 categories.

GPT-5 (medium)

CreatorOpenAI
TypeProprietary
Context128K
Score70

Z-1

CreatorZ
TypeProprietary
Context128K
Score43

Knowledge

GPT-5 (medium)

GPT-5 (medium)

88

Z-1

49.8

91
MMLU
52
89
GPQA
51
87
SuperGPQA
49
85
OpenBookQA
47

Coding

GPT-5 (medium)

GPT-5 (medium)

83

Z-1

44

83
HumanEval
44

Mathematics

GPT-5 (medium)

GPT-5 (medium)

92

Z-1

51

93
AIME 2023
52
95
AIME 2024
54
94
AIME 2025
53
89
HMMT Feb 2023
48
91
HMMT Feb 2024
50
90
HMMT Feb 2025
49
92
BRUMO 2025
51

Reasoning

GPT-5 (medium)

GPT-5 (medium)

86

Z-1

49

87
SimpleQA
50
85
MuSR
48

Frequently Asked Questions

Which is better, GPT-5 (medium) or Z-1?

GPT-5 (medium) scores higher overall with 70 vs 43, a difference of 27 points across all benchmarks.

Which is better for knowledge tasks, GPT-5 (medium) or Z-1?

GPT-5 (medium) leads in knowledge tasks with an average score of 88 vs 49.8.

Which is better for coding, GPT-5 (medium) or Z-1?

GPT-5 (medium) leads in coding with an average score of 83 vs 44.

Which is better for math, GPT-5 (medium) or Z-1?

GPT-5 (medium) leads in math with an average score of 92 vs 51.

Which is better for reasoning, GPT-5 (medium) or Z-1?

GPT-5 (medium) leads in reasoning with an average score of 86 vs 49.

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