# ByteDance Seed-2.1-Pro API

> Seed 2.1 Pro is the larger of the two models in ByteDance Seed's Seed2.1 family, offered as Doubao-Seed-2.1-Pro through Doubao and Volcano Engine. ByteDance built Seed2.1 for real-world productivity: multi-step general agent work such as planning, document processing and tool use, end-to-end coding from requirement analysis to validation, and computer-use tasks. It also brings strong image, document and long-video understanding, and Seed 2.1 Turbo is the smaller sibling.

Source: https://www.sandbase.ai/models/bytedance/seed-2.1-pro
API reference: https://www.sandbase.ai/models/bytedance/seed-2.1-pro/docs

## Facts

- Provider: ByteDance
- Type: Language model
- Model ID: `bytedance/seed-2.1-pro`
- Price: $0.89 per 1M input tokens, $4.45 per 1M output tokens
- Context window: 1M tokens, up to 262.1K output tokens
- Capabilities: chat, vision, reasoning, structured output, function calling
- Billing: pay per use from one SandBase balance; no provider account or subscription needed

## Call it

- Chat Completions API: `POST https://api.sandbase.ai/v1/chat/completions`

```bash
curl -X POST https://api.sandbase.ai/v1/chat/completions \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "bytedance/seed-2.1-pro",
  "messages": [
    {
      "role": "user",
      "content": "Hello"
    }
  ],
  "max_tokens": 2048
}'
```

## FAQ

### How do I call ByteDance Seed-2.1-Pro through SandBase?

Create a SandBase API key, then send requests with the model ID "bytedance/seed-2.1-pro" to Chat Completions API (/v1/chat/completions) at https://api.sandbase.ai. The request examples on this page show the exact payload.

### How much does ByteDance Seed-2.1-Pro cost?

$0.89 per 1M input tokens and $4.45 per 1M output tokens, billed per request from your SandBase balance. Discounts, when available, are shown in the pricing on this page.

### What is the context window of ByteDance Seed-2.1-Pro?

1M tokens of context, with up to 262.1K output tokens per response.

### Which features does ByteDance Seed-2.1-Pro support?

ByteDance Seed-2.1-Pro supports vision (image input), reasoning, function calling, structured output. See Specifications above for the full list.

### Do I need a separate ByteDance account?

No. One SandBase API key and balance gives you access to ByteDance Seed-2.1-Pro and the other models in the catalog; you do not need to sign up with ByteDance separately.