Qwen3.5 Plus vs DeepSeek V4.1 Flash 1017 Fast
Both have similar output pricing, while DeepSeek V4.1 Flash 1017 Fast offers a larger context window. Choose Qwen3.5 Plus or DeepSeek V4.1 Flash 1017 Fast based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Qwen3.5 Plus | DeepSeek V4.1 Flash 1017 Fast |
|---|---|---|
| Provider | Alibaba | Vercel AI Gateway |
| Input / 1M tokens | $0.40 | $0.60 |
| Output / 1M tokens | $2.40 | $2.40 |
| Context window | 1M | 1M |
| Parameters | — | — |
| Open weights | No | Yes |
| Released | Feb 2026 | Oct 2026 |
| GPQA Diamond score | 84.8 | — |
| FrontierMath score | 21.0 | — |
| Epoch Capabilities Index score | 146 | — |
FAQ
Is Qwen3.5 Plus or DeepSeek V4.1 Flash 1017 Fast cheaper?
Qwen3.5 Plus and DeepSeek V4.1 Flash 1017 Fast have comparable output pricing.
Which has the larger context window, Qwen3.5 Plus or DeepSeek V4.1 Flash 1017 Fast?
DeepSeek V4.1 Flash 1017 Fast has the larger context window (1M tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.