Compare / head-to-head
DeepSeek V4.1 FlashvsQwen3.5 397B-A17B
DeepSeek V4.1 Flash leads 1 of 1 shared benchmark. DeepSeek V4.1 Flash is 2.9x cheaper per token. DeepSeek V4.1 Flash has the larger context window (1M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
1 – 0
DeepSeek V4.1 Flash leads
Cheaper per token
DeepSeek V4.1 Flash
2.9x cheaper, input + output
Larger context
DeepSeek V4.1 Flash
1M tokens
Provider uptime (30d)
100% · —
DeepSeek · Qwen
DeepSeek V4.1 Flash
DeepSeek · released 2026-09-10
textvision
Qwen3.5 397B-A17B
Qwen · released 2026-02-15
textvision
Quality
Benchmark matrix
1 shared · 2 only DeepSeek V4.1 Flash · 6 only Qwen3.5 397B-A17B| Benchmark | DeepSeek V4.1 Flash | Qwen3.5 397B-A17B | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 1 | ||||
| GPQA Diamond | 90.9% ↗ | 88.4% ↗ | +2.5 pt | DeepSeek V4.1 Flash |
| Only DeepSeek V4.1 Flash reports · 2 | ||||
| DeepSWE v1.1 | 74.2% ↗ | not reported | — | — |
| Terminal-Bench 2.1 | 90.6% ↗ | not reported | — | — |
| Only Qwen3.5 397B-A17B reports · 6 | ||||
| SWE-bench Verified | not reported | 76.4% ↗ | — | — |
| MMLU-Pro | not reported | 87.8% ↗ | — | — |
| AIME 2026 | not reported | 94.2% ↗matharena ⚠ | — | — |
| LMArena Elo | not reported | 1438.3 ↗ | — | — |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | not reported | 29.5% ↗epoch | — | — |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | not reported | 88.9% ↗epoch | — | — |
Scores tagged "epoch" or "matharena" are independent runs, used only where the lab has not published its own; ⚠ marks rows MathArena flags as released after the competition. Higher is better on every row. Δ is DeepSeek V4.1 Flash minus Qwen3.5 397B-A17B in the benchmark's own unit. "Not reported" means the lab has not published that figure; it is not a zero. ↗ opens the source.
Specs & pricing
Side by side
Official pricing pages and model cards| Spec | DeepSeek V4.1 Flash | Qwen3.5 397B-A17B | Edge |
|---|---|---|---|
| Context window | 1M tokens | 262K tokens | DeepSeek V4.1 Flash |
| Max output | 384K tokens | — | — |
| Input price / 1M | $0.14 ↗ | $0.172 ↗ | DeepSeek V4.1 Flash |
| Output price / 1M | $0.28 ↗ | $1.03 ↗ | DeepSeek V4.1 Flash |
| Cached input / 1M | $0.003 ↗ | — | — |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $0.42 | $1.2 | DeepSeek V4.1 Flash |
| Modalities | text · vision | text · vision | Tie |
| Released | 2026-09-10 | 2026-02-15 | — |
| Cited benchmark scores | 3 | 8 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
DeepSeek V4.1 Flash vs …
Models sharing the most benchmarksMore matchups
Qwen3.5 397B-A17B vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run DeepSeek V4.1 Flash and Qwen3.5 397B-A17B on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.