Flagship ByteDance Seed 2.1 model for complex multimodal reasoning, coding, and agents
Seed 2.1 Pro by bytedance-seed is offered by 2 providers on this page. Its reference price is $0.891 per 1M input tokens and $4.45 per 1M output tokens. The lowest paid channel is Ofox at $0.707 / $3.54 per 1M, about 1.3× below the reference price. That channel is a third-party gateway, so confirm its availability and rate limits before depending on it.
The context window is 256,000 tokens, with an output limit of 256,000 tokens. It supports reasoning, tool use, and structured output. Accepted input modalities are Text, Image, and Video.
| Provider | Tier | Input | Output | Cache read | Cache write | Context | Output limit | Status |
|---|---|---|---|---|---|---|---|---|
| Ofox volcengine/doubao-seed-2.1-pro | Gateway | $0.707 | $3.54 | $0.142 | $0.002 | 256,000 | 256,000 | |
| Volcengine Ark doubao-seed-2-1-pro-260628 | Gateway | $0.891 | $4.45 | $0.178 | — | 256,000 | 256,000 |
Sorted by blended price (input×0.75 + output×0.25) asc. The official channel always shows regardless of rank. Whether a gateway's low price is actually usable can't be verified.