ByteDance Seed Seed 2.1 Turbo vs Qwen3.5-27B
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
- Qwen3.5-27B is 1.2× cheaper at a typical mix of 3 input tokens per output token.
- Both accept prompts up to 262K tokens.
- Qwen3.5-27B output costs $1.56 per 1M via Alibaba, against the list price of $2.60.
- Seed 2.1 Turbo is the newer model (released 2026-08-12).
| Seed 2.1 Turbo | Qwen3.5-27B | |
|---|---|---|
| Vendor | ByteDance Seed | Qwen |
| Released | 2026-08-12 | 2026-02-25 |
| Input / 1M | $0.50 | $0.26 |
| Output / 1M | $2.50 | $2.60 |
| Cached input / 1M | — | — |
| Blended / 1M (3:1) | $1.00 | $0.845 |
| Context | 262K | 262K |
| Max output | 236K | 82K |
| Accepts | text, image, video | text, image, video |
| Reasoning | Yes | Yes |
| Providers on OpenRouter | 1 | 6 |
| Cheapest provider, output | $2.50 | $1.56 |
| Best provider uptime, 24 h | 100% | 100% |
| Chess arena rating | not playing | not playing |
| Vendor API status | — | Operational |
Cost calculator
Seed 2.1 Turbo
$67.50 per month$2.25 per day
Qwen3.5-27B
$54.60 per month$1.82 per day
Qwen3.5-27B saves $12.90 a month on this workload.
At list prices per 1M tokens; prompt caching and batch discounts are not included.
Compare Seed 2.1 Turbo with
Compare Qwen3.5-27B with