Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
Qwen3.5 397B is clearly ahead on the aggregate, 71 to 56. 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 49.3. The single biggest benchmark swing on the page is IFEval, 82 to 93.9. o3-mini does hit back in knowledge, so the answer changes if that is the part of the workload you care about most.
o3-mini is also the more expensive model on tokens at $1.10 input / $4.40 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. o3-mini 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. o3-mini 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. o3-mini only becomes the better choice if knowledge is the priority or you need the larger 200K context window.
Qwen3.5 397B
67.7
o3-mini
82.1
Qwen3.5 397B
52
o3-mini
49.3
Qwen3.5 397B
81.9
o3-mini
87.3
Qwen3.5 397B
82
o3-mini
93.9
Qwen3.5 397B is ahead overall, 71 to 56. The biggest single separator in this matchup is IFEval, where the scores are 82 and 93.9.
o3-mini has the edge for knowledge tasks in this comparison, averaging 82.1 versus 67.7. Inside this category, GPQA is the benchmark that creates the most daylight between them.
Qwen3.5 397B has the edge for coding in this comparison, averaging 52 versus 49.3. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
o3-mini has the edge for math in this comparison, averaging 87.3 versus 81.9. Inside this category, AIME 2024 is the benchmark that creates the most daylight between them.
o3-mini has the edge for instruction following in this comparison, averaging 93.9 versus 82. Inside this category, IFEval is the benchmark that creates the most daylight between them.
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