Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.
Qwen3.5 397B (Reasoning) is clearly ahead on the aggregate, 75 to 63. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Qwen3.5 397B (Reasoning)'s sharpest advantage is in coding, where it averages 62.3 against 41.4. The single biggest benchmark swing on the page is Terminal-Bench 2.0, 77 to 52. Seed-2.0-Lite does hit back in multimodal & grounded, so the answer changes if that is the part of the workload you care about most.
Qwen3.5 397B (Reasoning) is the reasoning model in the pair, while Seed-2.0-Lite 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. Seed-2.0-Lite gives you the larger context window at 256K, compared with 128K for Qwen3.5 397B (Reasoning).
Pick Qwen3.5 397B (Reasoning) if you want the stronger benchmark profile. Seed-2.0-Lite only becomes the better choice if multimodal & grounded is the priority or you need the larger 256K context window.
Qwen3.5 397B (Reasoning)
74.8
Seed-2.0-Lite
55.1
Qwen3.5 397B (Reasoning)
62.3
Seed-2.0-Lite
41.4
Qwen3.5 397B (Reasoning)
70.8
Seed-2.0-Lite
79.6
Qwen3.5 397B (Reasoning)
84.2
Seed-2.0-Lite
73
Qwen3.5 397B (Reasoning)
70.1
Seed-2.0-Lite
53.9
Qwen3.5 397B (Reasoning)
89
Seed-2.0-Lite
89
Qwen3.5 397B (Reasoning)
87.8
Seed-2.0-Lite
82.5
Qwen3.5 397B (Reasoning)
92.5
Seed-2.0-Lite
75
Qwen3.5 397B (Reasoning) is ahead overall, 75 to 63. The biggest single separator in this matchup is Terminal-Bench 2.0, where the scores are 77 and 52.
Qwen3.5 397B (Reasoning) has the edge for knowledge tasks in this comparison, averaging 70.1 versus 53.9. Inside this category, HLE is the benchmark that creates the most daylight between them.
Qwen3.5 397B (Reasoning) has the edge for coding in this comparison, averaging 62.3 versus 41.4. Inside this category, LiveCodeBench is the benchmark that creates the most daylight between them.
Qwen3.5 397B (Reasoning) has the edge for math in this comparison, averaging 92.5 versus 75. Inside this category, AIME 2023 is the benchmark that creates the most daylight between them.
Qwen3.5 397B (Reasoning) has the edge for reasoning in this comparison, averaging 84.2 versus 73. Inside this category, SimpleQA is the benchmark that creates the most daylight between them.
Qwen3.5 397B (Reasoning) has the edge for agentic tasks in this comparison, averaging 74.8 versus 55.1. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
Seed-2.0-Lite has the edge for multimodal and grounded tasks in this comparison, averaging 79.6 versus 70.8. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.
Qwen3.5 397B (Reasoning) and Seed-2.0-Lite are effectively tied for instruction following here, both landing at 89 on average.
Qwen3.5 397B (Reasoning) has the edge for multilingual tasks in this comparison, averaging 87.8 versus 82.5. Inside this category, MMLU-ProX is the benchmark that creates the most daylight between them.
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