Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
Qwen3.5 397B is clearly ahead on the aggregate, 71 to 51. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Qwen3.5 397B's sharpest advantage is in coding, where it averages 52 against 41. The single biggest benchmark swing on the page is AIME 2024, 85 to 74.3. o1 does hit back in knowledge, so the answer changes if that is the part of the workload you care about most.
o1 is also the more expensive model on tokens at $15.00 input / $60.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for Qwen3.5 397B. That is roughly Infinityx on output cost alone. o1 is the reasoning model in the pair, while Qwen3.5 397B is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. o1 gives you the larger context window at 200K, compared with 128K for Qwen3.5 397B.
Pick Qwen3.5 397B if you want the stronger benchmark profile. o1 only becomes the better choice if knowledge is the priority or you need the larger 200K context window.
Qwen3.5 397B
67.7
o1
83.8
Qwen3.5 397B
52
o1
41
Qwen3.5 397B
81.9
o1
74.3
Qwen3.5 397B
82
o1
92.2
Qwen3.5 397B is ahead overall, 71 to 51. The biggest single separator in this matchup is AIME 2024, where the scores are 85 and 74.3.
o1 has the edge for knowledge tasks in this comparison, averaging 83.8 versus 67.7. Inside this category, MMLU is the benchmark that creates the most daylight between them.
Qwen3.5 397B has the edge for coding in this comparison, averaging 52 versus 41. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
Qwen3.5 397B has the edge for math in this comparison, averaging 81.9 versus 74.3. Inside this category, AIME 2024 is the benchmark that creates the most daylight between them.
o1 has the edge for instruction following in this comparison, averaging 92.2 versus 82. Inside this category, IFEval is the benchmark that creates the most daylight between them.
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