Seed 2.1 Turbo
by ByteDance SeedReleased Aug 12, 2026
bytedance-seed/seed-2-1-turbo- Reads images
- Calls tools
- Answers in a JSON schema
- Reasons before it answers
Seed 2.1 Turbo is a multimodal model from ByteDance Seed for coding and long-horizon agent workflows. It is suited for end-to-end software delivery, multi-step task execution, and understanding visual and...
- Input / 1M tokens
- $0.60
- Output / 1M tokens
- $3.00
- Context
- 262K
- Longest answer
- 236K
What it costs
What each call is charged to the token's AI credit.
| Billed for | You pay |
|---|---|
| Input tokens | $0.60 / 1M |
| Output tokens | $3.00 / 1M |
A typical call
A short chat turn: 2,000 tokens in, 500 out.
- per call
- $0.0027
- calls per $20
- 7,407
What it can do
From its listing. The router passes every field through.
- Reads imagesYes
- Reads files and PDFsNo
- Hears audioNo
- Calls toolsYes
- Answers in a JSON schemaYes
- Reasons before it answersYes
- Searches the webNo
- Caches long promptsNo
- Draws imagesNo
Call it
Any router key works, in the format your SDK already speaks.
import OpenAI from "openai";const ai = new OpenAI({ baseURL: "https://relayfor.si/api/v1", apiKey: process.env.RELAYFOR_ROUTER_KEY,});const reply = await ai.chat.completions.create({ model: "bytedance-seed/seed-2-1-turbo", messages: [{ role: "user", content: "Welcome the 1,000th holder in one line." }],});Specifications
What its maker and providers list for it.
- Reads
- Text, Images, and Video
- Writes
- Text
- Context
- 262,144 tokens
- Longest answer
- 235,929 tokens
- Released
- Aug 12, 2026
- Moderation
- None
Request fields
The fields its providers accept, passed through as you send them.
- frequency_penalty
- include_reasoning
- max_tokens
- reasoning
- response_format
- stop
- structured_outputs
- temperature
- tool_choice
- tools
- top_p
Questions
How much does Seed 2.1 Turbo cost?
$0.60 per million input tokens and $3.00 per million output tokens, paid from the token's AI credit. A call of 2,000 tokens in and 500 out costs about $0.0027.
How do I call Seed 2.1 Turbo?
Make a router key for one of your tokens on the dashboard, point any OpenAI or Anthropic SDK at https://relayfor.si/api/v1 and send the model id bytedance-seed/seed-2-1-turbo. The token's AI credit pays for each call.
How long a prompt can Seed 2.1 Turbo take?
Up to 262,144 tokens of context, and up to 235,929 tokens in one answer.
Are my prompts stored?
No. The RFS Router passes each call through and keeps only its token counts and cost, for the token's usage page.
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