GPT-5 (high) vs Z-1

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

Quick Verdict

GPT-5 (high) wins overall with a score of 72 vs 43 (29 point difference).GPT-5 (high) wins 4 out of 4 categories.

Knowledge

GPT-5 (high)

GPT-5 (high)

90

Z-1

49.8

93
MMLU
52
91
GPQA
51
89
SuperGPQA
49
87
OpenBookQA
47

Coding

GPT-5 (high)

GPT-5 (high)

85

Z-1

44

85
HumanEval
44

Mathematics

GPT-5 (high)

GPT-5 (high)

94

Z-1

51

95
AIME 2023
52
97
AIME 2024
54
96
AIME 2025
53
91
HMMT Feb 2023
48
93
HMMT Feb 2024
50
92
HMMT Feb 2025
49
94
BRUMO 2025
51

Reasoning

GPT-5 (high)

GPT-5 (high)

88

Z-1

49

89
SimpleQA
50
87
MuSR
48

Frequently Asked Questions

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

GPT-5 (high) scores higher overall with 72 vs 43, a difference of 29 points across all benchmarks.

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

GPT-5 (high) leads in knowledge tasks with an average score of 90 vs 49.8.

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

GPT-5 (high) leads in coding with an average score of 85 vs 44.

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

GPT-5 (high) leads in math with an average score of 94 vs 51.

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

GPT-5 (high) leads in reasoning with an average score of 88 vs 49.