GPT-OSS 120B vs Qwen3.5 397B

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

Quick Verdict

Qwen3.5 397B wins overall with a score of 65 vs 42 (23 point difference).Qwen3.5 397B wins 4 out of 4 categories.

Knowledge

Qwen3.5 397B

GPT-OSS 120B

48.8

Qwen3.5 397B

80.8

51
MMLU
83
50
GPQA
82
48
SuperGPQA
80
46
OpenBookQA
78

Coding

Qwen3.5 397B

GPT-OSS 120B

43

Qwen3.5 397B

75

43
HumanEval
75

Mathematics

Qwen3.5 397B

GPT-OSS 120B

50

Qwen3.5 397B

82

51
AIME 2023
83
53
AIME 2024
85
52
AIME 2025
84
47
HMMT Feb 2023
79
49
HMMT Feb 2024
81
48
HMMT Feb 2025
80
50
BRUMO 2025
82

Reasoning

Qwen3.5 397B

GPT-OSS 120B

48

Qwen3.5 397B

79

49
SimpleQA
80
47
MuSR
78

Frequently Asked Questions

Which is better, GPT-OSS 120B or Qwen3.5 397B?

Qwen3.5 397B scores higher overall with 65 vs 42, a difference of 23 points across all benchmarks.

Which is better for knowledge tasks, GPT-OSS 120B or Qwen3.5 397B?

Qwen3.5 397B leads in knowledge tasks with an average score of 80.8 vs 48.8.

Which is better for coding, GPT-OSS 120B or Qwen3.5 397B?

Qwen3.5 397B leads in coding with an average score of 75 vs 43.

Which is better for math, GPT-OSS 120B or Qwen3.5 397B?

Qwen3.5 397B leads in math with an average score of 82 vs 50.

Which is better for reasoning, GPT-OSS 120B or Qwen3.5 397B?

Qwen3.5 397B leads in reasoning with an average score of 79 vs 48.