GPT-OSS 120B vs Qwen3.5 397B (Reasoning)

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

Quick Verdict

Qwen3.5 397B (Reasoning) wins overall with a score of 70 vs 42 (28 point difference).Qwen3.5 397B (Reasoning) wins 4 out of 4 categories.

Knowledge

Qwen3.5 397B (Reasoning)

GPT-OSS 120B

48.8

Qwen3.5 397B (Reasoning)

88

51
MMLU
91
50
GPQA
89
48
SuperGPQA
87
46
OpenBookQA
85

Coding

Qwen3.5 397B (Reasoning)

GPT-OSS 120B

43

Qwen3.5 397B (Reasoning)

83

43
HumanEval
83

Mathematics

Qwen3.5 397B (Reasoning)

GPT-OSS 120B

50

Qwen3.5 397B (Reasoning)

92

51
AIME 2023
93
53
AIME 2024
95
52
AIME 2025
94
47
HMMT Feb 2023
89
49
HMMT Feb 2024
91
48
HMMT Feb 2025
90
50
BRUMO 2025
92

Reasoning

Qwen3.5 397B (Reasoning)

GPT-OSS 120B

48

Qwen3.5 397B (Reasoning)

86

49
SimpleQA
87
47
MuSR
85

Frequently Asked Questions

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

Qwen3.5 397B (Reasoning) scores higher overall with 70 vs 42, a difference of 28 points across all benchmarks.

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

Qwen3.5 397B (Reasoning) leads in knowledge tasks with an average score of 88 vs 48.8.

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

Qwen3.5 397B (Reasoning) leads in coding with an average score of 83 vs 43.

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

Qwen3.5 397B (Reasoning) leads in math with an average score of 92 vs 50.

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

Qwen3.5 397B (Reasoning) leads in reasoning with an average score of 86 vs 48.