GPT-5.1 vs Qwen3.5 397B (Reasoning)

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

Quick Verdict

GPT-5.1 wins overall with a score of 76 vs 70 (6 point difference).GPT-5.1 wins 4 out of 4 categories.

Knowledge

GPT-5.1

GPT-5.1

94

Qwen3.5 397B (Reasoning)

88

97
MMLU
91
95
GPQA
89
93
SuperGPQA
87
91
OpenBookQA
85

Coding

GPT-5.1

GPT-5.1

89

Qwen3.5 397B (Reasoning)

83

89
HumanEval
83

Mathematics

GPT-5.1

GPT-5.1

97.1

Qwen3.5 397B (Reasoning)

92

99
AIME 2023
93
99
AIME 2024
95
98
AIME 2025
94
95
HMMT Feb 2023
89
97
HMMT Feb 2024
91
96
HMMT Feb 2025
90
96
BRUMO 2025
92

Reasoning

GPT-5.1

GPT-5.1

92

Qwen3.5 397B (Reasoning)

86

93
SimpleQA
87
91
MuSR
85

Frequently Asked Questions

Which is better, GPT-5.1 or Qwen3.5 397B (Reasoning)?

GPT-5.1 scores higher overall with 76 vs 70, a difference of 6 points across all benchmarks.

Which is better for knowledge tasks, GPT-5.1 or Qwen3.5 397B (Reasoning)?

GPT-5.1 leads in knowledge tasks with an average score of 94 vs 88.

Which is better for coding, GPT-5.1 or Qwen3.5 397B (Reasoning)?

GPT-5.1 leads in coding with an average score of 89 vs 83.

Which is better for math, GPT-5.1 or Qwen3.5 397B (Reasoning)?

GPT-5.1 leads in math with an average score of 97.1 vs 92.

Which is better for reasoning, GPT-5.1 or Qwen3.5 397B (Reasoning)?

GPT-5.1 leads in reasoning with an average score of 92 vs 86.