Head-to-head comparison across 3benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
DeepSeek V4 Flash
59
Qwen3.5 397B
64
Verified leaderboard positions: DeepSeek V4 Flash #23 · Qwen3.5 397B #14
Pick Qwen3.5 397B if you want the stronger benchmark profile. DeepSeek V4 Flash only becomes the better choice if you want the cheaper token bill or you need the larger 1M context window.
Agentic
+7.1 difference
Coding
+3.2 difference
Knowledge
+20.0 difference
DeepSeek V4 Flash
Qwen3.5 397B
$0.14 / $0.28
$0.6 / $3.6
N/A
96 t/s
N/A
2.44s
1M
128K
Pick Qwen3.5 397B if you want the stronger benchmark profile. DeepSeek V4 Flash only becomes the better choice if you want the cheaper token bill or you need the larger 1M context window.
Qwen3.5 397B is clearly ahead on the provisional aggregate, 64 to 59. 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 knowledge, where it averages 65.2 against 45.2. The single biggest benchmark swing on the page is HLE, 8.1% to 28.7%.
Qwen3.5 397B is also the more expensive model on tokens at $0.60 input / $3.60 output per 1M tokens, versus $0.14 input / $0.28 output per 1M tokens for DeepSeek V4 Flash. That is roughly 12.9x on output cost alone. DeepSeek V4 Flash gives you the larger context window at 1M, compared with 128K for Qwen3.5 397B.
Qwen3.5 397B is ahead on BenchLM's provisional leaderboard, 64 to 59. The biggest single separator in this matchup is HLE, where the scores are 8.1% and 28.7%.
Qwen3.5 397B has the edge for knowledge tasks in this comparison, averaging 65.2 versus 45.2. Inside this category, HLE is the benchmark that creates the most daylight between them.
Qwen3.5 397B has the edge for coding in this comparison, averaging 60.3 versus 57.1. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
Qwen3.5 397B has the edge for agentic tasks in this comparison, averaging 56.2 versus 49.1. Inside this category, MCP Atlas is the benchmark that creates the most daylight between them.
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