GPT-5 mini vs Z-1

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

Quick Verdict

GPT-5 mini wins overall with a score of 68 vs 43 (25 point difference).GPT-5 mini wins 4 out of 4 categories.

Knowledge

GPT-5 mini

GPT-5 mini

85

Z-1

49.8

88
MMLU
52
86
GPQA
51
84
SuperGPQA
49
82
OpenBookQA
47

Coding

GPT-5 mini

GPT-5 mini

80

Z-1

44

80
HumanEval
44

Mathematics

GPT-5 mini

GPT-5 mini

89

Z-1

51

90
AIME 2023
52
92
AIME 2024
54
91
AIME 2025
53
86
HMMT Feb 2023
48
88
HMMT Feb 2024
50
87
HMMT Feb 2025
49
89
BRUMO 2025
51

Reasoning

GPT-5 mini

GPT-5 mini

83

Z-1

49

84
SimpleQA
50
82
MuSR
48

Frequently Asked Questions

Which is better, GPT-5 mini or Z-1?

GPT-5 mini scores higher overall with 68 vs 43, a difference of 25 points across all benchmarks.

Which is better for knowledge tasks, GPT-5 mini or Z-1?

GPT-5 mini leads in knowledge tasks with an average score of 85 vs 49.8.

Which is better for coding, GPT-5 mini or Z-1?

GPT-5 mini leads in coding with an average score of 80 vs 44.

Which is better for math, GPT-5 mini or Z-1?

GPT-5 mini leads in math with an average score of 89 vs 51.

Which is better for reasoning, GPT-5 mini or Z-1?

GPT-5 mini leads in reasoning with an average score of 83 vs 49.