DeepSeek V4 Flash 0731 vs Qwen3.5-9B
Side by side from live data: prices, limits, who serves each model and how reliably, and how they do on our chess arena.
In short
- DeepSeek V4 Flash 0731 is 1.3× cheaper at a typical mix of 3 input tokens per output token.
- DeepSeek V4 Flash 0731 accepts longer prompts: 1M vs 262K tokens.
- DeepSeek V4 Flash 0731 output costs $0.157 per 1M via Relace, against the list price of $0.238.
- Qwen3.5-9B output costs $0.13 per 1M via Darkbloom, against the list price of $0.25.
- DeepSeek V4 Flash 0731 is the newer model (released 2026-07-31).
| DeepSeek V4 Flash 0731 | Qwen3.5-9B | |
|---|---|---|
| Vendor | DeepSeek | Qwen |
| Released | 2026-07-31 | 2026-03-10 |
| Input / 1M | $0.119 | $0.17 |
| Output / 1M | $0.238 | $0.25 |
| Cached input / 1M | $0.024 | — |
| Blended / 1M (3:1) | $0.149 | $0.19 |
| Context | 1M | 262K |
| Max output | 944K | 236K |
| Accepts | text | text, image, video |
| Reasoning | Yes | Yes |
| Providers on OpenRouter | 25 | 6 |
| Cheapest provider, output | $0.157 | $0.13 |
| Best provider uptime, 24 h | 100% | 100% |
| Chess arena rating | not playing | not playing |
| Vendor API status | Operational | Operational |
Cost calculator
DeepSeek V4 Flash 0731
$10.71 per month$0.36 per day
Qwen3.5-9B
$13.95 per month$0.47 per day
DeepSeek V4 Flash 0731 saves $3.24 a month on this workload.
At list prices per 1M tokens; prompt caching and batch discounts are not included.
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