Seed 2.1 Turbo API

bytedance-seed/seed-2-1-turbo
ByteDance's multimodal model for coding and long-horizon agent workflows.
Context
262K tokens
Input
$0.6877 / 1M tokens
Output
$3.4385 / 1M tokens
Released
Aug 10, 2026

How to use Seed 2.1 Turbo API

Install any OpenAI-compatible SDK, point it at api.aimlapi.com/v1, and set the model to bytedance-seed/seed-2-1-turbo.
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.

Seed 2.1 Turbo API Pricing

TypePrice
Input
$0.6877 / 1M tokens
Output
$3.4385 / 1M tokens

Seed 2.1 Turbo vs other models

ModelInputOutputContextBest for
$0.6877 / 1M tokens
$3.4385 / 1M tokens
262K tokens
Long-horizon coding agents
$0.34385 / 1M tokens
$2.7508 / 1M tokens
262K tokens
Reasoning + agents
$2.6 / 1M tokens
$7.8 / 1M tokens
500K tokens
Reasoning + agents with long context
$5.2 / 1M tokens
$26 / 1M tokens
1M tokens
Frontier reasoning + agents
$0.6877 / 1M tokens
$4.1262 / 1M tokens
262K tokens
Agentic frontend & coding workflows

Frequently asked questions

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.

Start building with Seed 2.1 Turbo

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