GPT-OSS 120B vs Z-1

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

Quick Verdict

Z-1 wins overall with a score of 43 vs 42 (1 point difference).Z-1 wins 4 out of 4 categories.

Knowledge

Z-1

GPT-OSS 120B

48.8

Z-1

49.8

51
MMLU
52
50
GPQA
51
48
SuperGPQA
49
46
OpenBookQA
47

Coding

Z-1

GPT-OSS 120B

43

Z-1

44

43
HumanEval
44

Mathematics

Z-1

GPT-OSS 120B

50

Z-1

51

51
AIME 2023
52
53
AIME 2024
54
52
AIME 2025
53
47
HMMT Feb 2023
48
49
HMMT Feb 2024
50
48
HMMT Feb 2025
49
50
BRUMO 2025
51

Reasoning

Z-1

GPT-OSS 120B

48

Z-1

49

49
SimpleQA
50
47
MuSR
48

Frequently Asked Questions

Which is better, GPT-OSS 120B or Z-1?

Z-1 scores higher overall with 43 vs 42, a difference of 1 points across all benchmarks.

Which is better for knowledge tasks, GPT-OSS 120B or Z-1?

Z-1 leads in knowledge tasks with an average score of 49.8 vs 48.8.

Which is better for coding, GPT-OSS 120B or Z-1?

Z-1 leads in coding with an average score of 44 vs 43.

Which is better for math, GPT-OSS 120B or Z-1?

Z-1 leads in math with an average score of 51 vs 50.

Which is better for reasoning, GPT-OSS 120B or Z-1?

Z-1 leads in reasoning with an average score of 49 vs 48.