ByteDance Seed model for multimodal reasoning, long-context analysis, and agent workflows
Seed 1.8 by bytedance-seed is offered by 4 providers on this page. Its reference price is $0.25 per 1M input tokens and $2.00 per 1M output tokens. The lowest paid channel is Ofox at $0.12 / $0.29 per 1M, about 2.1× 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 and Image. Providers report the capability flags inconsistently, so verify a specific feature against the host you plan to use. Its training knowledge cuts off at 2024-10.
| Provider | Tier | Input | Output | Cache read | Cache write | Context | Output limit | Status |
|---|---|---|---|---|---|---|---|---|
| Ofox volcengine/doubao-seed-1-8 | Gateway | $0.12 | $0.29 | $0.023 | — | 256,000 | 64,000 | |
| Volcengine Ark doubao-seed-1-8-251228 | Cloud | $0.12 tiered >32K: $0.18 · >128K: $0.36 | $1.19 | $0.024 | — | 256,000 | 64,000 | |
| Vercel AI Gateway bytedance/seed-1.8 | Cloud | $0.25 tiered >128K: $0.50 | $2.00 | $0.05 | — | 256,000 | 32,768 | |
| Requesty seed-1.8 | Gateway | $0.25 | $2.00 | $0.05 | — | 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.
Interleaved thinking (reasoning between tool calls) is declared by 1 of 4 providers.
Price history accumulates from each data sync; currently only 1 sample(s) (2026-08-15). Each future sync adds a point, and once accumulated a line is drawn here.