Seed 1.8 overview
Seed 1.8 specs
- Model ID
bytedance/seed-1-8- Developer
- ByteDance
- Context window
- 256,000 tokens
- Max output
- 224,000 tokens
- Input
- Image, Text
- Output
- Text
- API
- OpenAI-compatible, base URL
https://api.aimlapi.com/v1
ByteDance Seed 1.8 is a large language model with a 256K context window optimized for long-context reasoning and generation.
Coding and code review
Generate, debug, and review code across languages, reading whole files or repos in a single prompt.
Agentic and multi-step workflows
Reliable tool-calling and instruction-following suit agent loops that plan, call tools, and iterate.
Long-document analysis
Summarize and extract from contracts, papers, and reports without aggressive chunking.
Use cases
Seed 1.8 is documented as suited to information retrieval, where it can gather and reconcile information across several steps. It is also suited to code generation and execution, including tasks where a coding agent generates a script, checks execution results, and revises the code after an error.
It is documented as suited to GUI interaction, where it can interpret screenshots or software interfaces and determine the next permitted action. It is also suited to complex workflows and multi-step task execution, including internal automation systems that coordinate several controlled tools and document workflows that combine long context, visual pages, and follow-up actions.
Capabilities
- Function calling
- Streaming
- Structured outputs
Seed 1.8 API pricing
| Usage | Price | Unit |
|---|---|---|
| Input | $0.25 | 1M tokens |
| Output | $2 | 1M tokens |
Prices from the AI/ML API price list, checked on Nov 4, 2026.
Seed 1.8 vs other models: token prices
AI/ML API input and output rates for 5 models, per million tokens.
| Model | Input | Output |
|---|---|---|
| $0.25 | $2 | |
| $0.1 | $0.4 | |
| $0.25 | $2 | |
| $0.529 | $2.65 | |
| $0.529 | $3.17 |
How to use the Seed 1.8 API
View docsBuild with your agent
Give your agent the model details, code and documentation.
1Get your API key
Create API keyexport AIMLAPI_KEY="8f2b4c7d9a1e6b3f…"2Make your first request
curl '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": "Write a haiku about the ocean."
}
]
}'import os
import requests
headers = {
"Authorization": f"Bearer {os.environ['AIMLAPI_KEY']}",
"Content-Type": "application/json",
}
payload = {
"model": "bytedance/seed-1-8",
"messages": [
{
"role": "user",
"content": "Write a haiku about the ocean."
}
]
}
response = requests.post("https://api.aimlapi.com/v1/chat/completions", headers=headers, json=payload, timeout=120)
response.raise_for_status()
print(response.json())const response = 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": "Write a haiku about the ocean."
}
]
}),
});
if (!response.ok) throw new Error(`HTTP ${response.status}`);
console.log(await response.json());Seed 1.8 FAQ
What is the context window of Seed 1.8?
Seed 1.8 has a 256,000 tokens context window and can return up to 224,000 tokens.
What inputs and outputs does Seed 1.8 support?
Seed 1.8 takes image, text as input and returns text.
What is the model ID for Seed 1.8?
Use bytedance/seed-1-8 as the model id. Requests go to https://api.aimlapi.com/v1/chat/completions.
How much does Seed 1.8 cost?
Seed 1.8 costs $0.25 input and $2 output per 1M tokens on AI/ML API, billed as you go with no subscription.
Does Seed 1.8 support streaming?
Yes, Seed 1.8 can stream responses as they are generated.
Can Seed 1.8 read images?
Yes, Seed 1.8 accepts image input alongside text.
Who created Seed 1.8?
Seed 1.8 was built by ByteDance.
What capabilities does Seed 1.8 offer?
It supports function calling, streaming, structured outputs, parallel tool calls, and vision input alongside text.