Faster ByteDance Seed 2.1 model for multimodal reasoning and latency-sensitive agent workflows
Seed 2.1 Turbo by bytedance-seed is offered by 8 providers on this page. Public prices are shown for 7 of them. Its reference price is $0.63 per 1M input tokens and $3.13 per 1M output tokens. The lowest paid channel is Ofox at $0.354 / $1.77 per 1M, about 1.8× below the reference price. That channel is a third-party gateway, so confirm its availability and rate limits before depending on it. It also has 1 covered by a paid subscription; free tiers usually carry rate limits, and subscription-covered access bills $0 per token only after the subscription fee.
The context window is 256,000 tokens at the reference host, but hosts report different limits, from 256,000 to 262,144, so the usable window depends on the provider you pick. 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 |
|---|---|---|---|---|---|---|---|---|
| Volcengine Ark Coding Plan doubao-seed-2.1-turbo | Gateway | Subscription | $0 | — | 256,000 | 256,000 | ||
| Ofox volcengine/doubao-seed-2.1-turbo | Gateway | $0.35 | $1.77 | $0.068 | $0.0019 | 256,000 | 256,000 | |
| Volcengine Ark doubao-seed-2-1-turbo-260628 | Cloud | $0.45 | $2.23 | $0.089 | — | 256,000 | 256,000 | |
| OpenRouter bytedance-seed/seed-2-1-turbo | Gateway | $0.50 | $2.50 | — | — | 262,144 ⚠ | 235,929 | |
| Vercel AI Gateway | Cloud | $0.50 | $2.50 | $0.10 | — | 262,144 ⚠ | 262,144 | |
| Kilo Gateway bytedance-seed/seed-2-1-turbo | Gateway | $0.50 | $2.50 | — | — | 262,144 ⚠ | 235,929 | |
| Venice AI seed-2-1-turbo | Gateway | $0.63 | $3.13 | $0.13 | — | 256,000 | 65,536 | |
| EmpirioLabs AI seed-2-1-turbo | Gateway | $0.63 | $3.13 | $0.63 | — | 256,000 | 65,536 |
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 2 of 8 providers.
1 / 8 providers expose no reasoning control (reasoning_options: []).
1 more channels offer $0 (Volcengine Ark Coding Plan); free tiers usually have rate limits and no SLA, excluded from ranking.