ByteDance Seed 1.8 API

bytedance/seed-1-8
ByteDance Seed 1.
Context
256K tokens
Input
$0.325 / 1M tokens
Output
$2.6 / 1M tokens

How to use ByteDance Seed 1.8 API

Install any OpenAI-compatible SDK, point it at api.aimlapi.com/v1, and set the model to bytedance/seed-1-8.
import requests

r = requests.post(
    "https://api.aimlapi.com/v1/chat/completions",
    headers={"Authorization": "Bearer " + AIMLAPI_KEY},
    json={
      "model": "bytedance/seed-1-8",
      "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-1-8",
    "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-1-8","messages":[{"role":"user","content":"Hello!"}]}'

OpenAI-compatible — swap the base URL and it works with your existing SDK.

ByteDance Seed 1.8 API Pricing

TypePrice
Input
$0.325 / 1M tokens
Output
$2.6 / 1M tokens

ByteDance Seed 1.8 vs other models

ModelInputOutputContextBest for
$0.325 / 1M tokens
$2.6 / 1M tokens
256K tokens
Coding + agents
$6.5 / 1M tokens
$39 / 1M tokens
1.05M tokens
Reasoning + agents
$2.6 / 1M tokens
$13 / 1M tokens
1M tokens
Balanced coding + agents
$3.9 / 1M tokens
$19.5 / 1M tokens
1M tokens
Long-context, multimodal & agentic workflows
$0.65 / 1M tokens
$3.9 / 1M tokens
1.05M tokens
Reasoning + agents

Frequently asked questions

ByteDance Seed 1.8 has a 256,000 tokens context window and can return up to 224,000 tokens.

ByteDance Seed 1.8 takes image, text as input and returns text.

Use bytedance/seed-1-8 as the model id. Requests go to https://api.aimlapi.com/v1/chat/completions.

ByteDance Seed 1.8 is priced at input $0.325 / 1M tokens, output $2.6 / 1M tokens.

Yes, ByteDance Seed 1.8 can stream responses as they are generated.

Yes, ByteDance Seed 1.8 accepts image input alongside text.

ByteDance Seed 1.8 was built by ByteDance.

It supports function calling, streaming responses, and structured outputs, along with parallel tool calls and vision input.

Start building with ByteDance Seed 1.8

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