---
title: Seed 1.8 API | Text Generation | ModelsLab
description: Seed 1.8 LLM excels in real-world agency with multi-step task execution, 4 thinking modes, optimized visual encoding cutting tokens 60%, and top.
url: https://modelslab.com/models/byteplus/seed-1.8.md
canonical: https://modelslab.com/models/byteplus/seed-1.8
type: product
component: Playground/LLM/Index
generated_at: 2026-09-21T10:41:40.540547Z
---

Seed 1.8
---

 [LLMs.txt](https://modelslab.com/models/byteplus/seed-1.8/llms.txt) [.md](https://modelslab.com/models/byteplus/seed-1.8.md)

Seed 1.8
---

Choose a prompt below to get started or type your own message

 Explain quantum computing in simple terms

 Write a Python function to sort a list

 Create a marketing email for a SaaS product

 Compare REST vs GraphQL APIs

images, PDFs and text files

Send

### Seed 1.8

byteplus seed-1.8

Copy model ID

PricingInput $3.00 / 1M tokens

Output $3.00 / 1M tokens

API EndpointsOpenAI Compatible

`https://modelslab.com/api/v7/llm/chat/completions`Endpoint

Anthropic Compatible

`https://modelslab.com/api/v7/llm/v1/messages`Messages

`https://modelslab.com/api/v7/llm/v1/messages/count_tokens`Count Tokens

`https://modelslab.com/api/v7/llm/v1/models`Models

Use with Claude Code

cURL Example

ParametersSystem MessageYou are a helpful AI assistant specialized in providing accurate and detailed responses.

Temperature0.7

Max Tokens1000

Top P0.9

Frequency Penalty0

Presence Penalty0

Model Info

Support

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About Seed 1.8
---

Seed 1.8 LLM excels in real-world agency with multi-step task execution, 4 thinking modes, optimized visual encoding cutting tokens 60%, and top benchmarks in reasoning, coding, STEM.\[1\]\[2\]\[3\]\[6\]\[8\]

### Technical Specifications

Model IDseed-1.8

CategoryLLM Models

TaskText Generation

Price$3 per million tokens

AddedJanuary 12, 2026

### Key Features

- Chat completion and multi-turn conversation API
- Streaming response with token-by-token output
- Function calling and tool use support
- System prompts and role-based messaging
- JSON mode and structured output

### Quick Start

Integrate Seed 1.8 into your application with a single API call. Get your API key from the [pricing page](https://modelslab.com/pricing) to get started.

PythonJavaScriptcURLPHP

```
<code>import requests
import json

url = "https://modelslab.com/api/v7/llm/chat/completions"

headers = {
    "Content-Type": "application/json"
}

data = {
        "model_id": "seed-1.8",
        "messages": [
            {
                "role": "user",
                "content": "Hello!"
            }
        ],
        "max_tokens": 1000,
        "key": "YOUR_API_KEY"
    }

try:
    response = requests.post(url, headers=headers, json=data)
    response.raise_for_status()  # Raises an HTTPError for bad responses (4XX or 5XX)
    result = response.json()
    print("API Response:")
    print(json.dumps(result, indent=2))
except requests.exceptions.HTTPError as http_err:
    print(f"HTTP error occurred: {http_err} - {response.text}")
except Exception as err:
    print(f"Other error occurred: {err}")</code>
```

### Pricing

Seed 1.8 API costs $3 per million tokens. Plans start at $21/month, and open-source models are unlimited on the $149/month plan. [View pricing plans](https://modelslab.com/pricing)

### Use Cases

- AI chatbots and virtual assistants
- Code generation and developer tools
- Content writing and copywriting automation
- Data analysis, summarization, and extraction

[Learn more about Seed 1.8](https://modelslab.com/seed-18) [Browse LLM Models](https://modelslab.com/models?feature=llmaster) [More from BytePlus](https://modelslab.com/models/open_router) [View Pricing](https://modelslab.com/pricing)

Seed 1.8 FAQ
---

### What is Seed 1.8?

Seed 1.8 LLM excels in real-world agency with multi-step task execution, 4 thinking modes, optimized visual encoding cutting tokens 60%, and top benchmarks in reasoning, coding, STEM.\[1\]\[2\]\[3\]\[6\]\[8\]

### How do I use the Seed 1.8 API?

You can integrate Seed 1.8 into your application with a single API call. Sign up on ModelsLab to get your API key, then use the model ID "seed-1.8" in your API requests. We provide SDKs for Python, JavaScript, and cURL examples in the API documentation.

### How much does Seed 1.8 cost?

Seed 1.8 costs $3 per million tokens. ModelsLab plans start at $21/month (Basic), and the $149/month Open Source plan includes unlimited generation on open-source models.

### What is the Seed 1.8 model ID?

The model ID for Seed 1.8 is "seed-1.8". Use this ID in your API requests to specify this model.

### Do I need a paid plan to use Seed 1.8?

Yes. ModelsLab is subscription-based with no free tier — plans start at $21/month (Basic, 3,250 API calls). The $149/month Open Source Unlimited plan includes unlimited generation across open-source models; premium third-party models are billed per call from your wallet.

---

*This markdown version is optimized for AI agents and LLMs.*

**Links:**
- [Website](https://modelslab.com)
- [API Documentation](https://docs.modelslab.com)
- [Blog](https://modelslab.com/blog)

---
*Generated by ModelsLab - 2026-09-21*