What is Seed 2.1 Turbo API?
ByteDance Seed 2.1 Turbo is a multimodal model for coding and long-horizon agent workflows, accepting text, image and video input across a 256K context window.
Technical Specifications
- Context window: 262,144 tokens
- Max output: 262,144 tokens
- Supported inputs: Image, Text
- Output: Text
Seed 2.1 Turbo API Pricing
- Input: $0.65 / 1M tokens
- Output: $3.25 / 1M tokens
Measured on the AI/ML API gateway across live traffic. Figures are medians unless stated. Last updated 2026-10-12.
High-value office work and complex everyday consultations, including multi-step tasks such as project planning, file processing, and tool use.
Code engineering workflows, including requirement understanding, coding, debugging, and validation in real development work.
Teaching, office, and research scenarios, such as generating lesson-plan slides, analyzing complex spreadsheets, and producing industry reports.
import requests r = requests.post( "https://api.aimlapi.com/v1/chat/completions", headers={"Authorization": "Bearer " + AIMLAPI_KEY}, json={ "model": "bytedance-seed/seed-2-1-turbo", "messages": [ { "role": "user", "content": "Hello!" } ] }, ) print(r.json())
const r = await fetch("https://api.aimlapi.com/v1/chat/completions", { method: "POST", headers: { Authorization: `Bearer ${process.env.AIMLAPI_KEY}`, "Content-Type": "application/json", }, body: JSON.stringify({ "model": "bytedance-seed/seed-2-1-turbo", "messages": [ { "role": "user", "content": "Hello!" } ] }), }); console.log(await r.json());
curl -X POST https://api.aimlapi.com/v1/chat/completions \ -H "Authorization: Bearer $AIMLAPI_KEY" \ -H "Content-Type: application/json" \ -d '{"model":"bytedance-seed/seed-2-1-turbo","messages":[{"role":"user","content":"Hello!"}]}'
OpenAI-compatible — swap the base URL and it works with your existing SDK.
| Type | Price |
|---|---|
| Input | |
| Output | |
| Model | Input | Output | Context | Best for |
|---|---|---|---|---|
Seed 2.1 Turbo This page | Long-horizon coding agents | |||
| Reasoning + agents | ||||
| Reasoning + agents with long context | ||||
| Frontier reasoning + agents | ||||
| Agentic frontend & coding workflows |
Seed 2.1 Turbo has a 262,144 tokens context window and can return up to 262,144 tokens.
Seed 2.1 Turbo takes image, text as input and returns text.
Use bytedance-seed/seed-2-1-turbo as the model id. Requests go to https://api.aimlapi.com/v1/chat/completions.
Seed 2.1 Turbo became available on August 10, 2026.
Seed 2.1 Turbo is priced at input $0.6877 / 1M tokens, output $3.4385 / 1M tokens.
Yes, Seed 2.1 Turbo can stream responses as they are generated.
Yes, Seed 2.1 Turbo accepts image input alongside text.
Seed 2.1 Turbo was built by ByteDance.
It is designed for coding tasks and long-horizon agent workflows, handling text and image input.
