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# ![DeepSeek 標誌](https://models.dev/logos/deepseek.svg)DeepSeek

透過 Mastra 的模型路由器存取 4 個 DeepSeek 模型。系統會自動使用 `DEEPSEEK_API_KEY` 環境變數完成身分驗證。

如需進一步了解，請參閱[DeepSeek 文件](https://api-docs.deepseek.com/quick_start/pricing)。

```bash
DEEPSEEK_API_KEY=your-api-key
```

```typescript
import { Agent } from '@mastra/core/agent'

const agent = new Agent({
  id: 'my-agent',
  name: 'My Agent',
  instructions: 'You are a helpful assistant',
  model: 'deepseek/deepseek-chat',
})

// Generate a response
const response = await agent.generate('Hello!')

// Stream a response
const stream = await agent.stream('Tell me a story')
for await (const chunk of stream) {
  console.log(chunk)
}
```

## 模型

| Model                        | Context | Tools | Reasoning | Image | Audio | Video | Input $/1M | Output $/1M |
| ---------------------------- | ------- | ----- | --------- | ----- | ----- | ----- | ---------- | ----------- |
| `deepseek/deepseek-chat`     | 1.0M    |       |           |       |       |       | $0.14      | $0.28       |
| `deepseek/deepseek-reasoner` | 1.0M    |       |           |       |       |       | $0.14      | $0.28       |
| `deepseek/deepseek-v4-flash` | 1.0M    |       |           |       |       |       | $0.14      | $0.28       |
| `deepseek/deepseek-v4-pro`   | 1.0M    |       |           |       |       |       | $0.43      | $0.87       |

## 進階設定

### 自訂標頭

```typescript
const agent = new Agent({
  id: 'custom-agent',
  name: 'custom-agent',
  model: {
    url: 'https://api.deepseek.com',
    id: 'deepseek/deepseek-chat',
    apiKey: process.env.DEEPSEEK_API_KEY,
    headers: {
      'X-Custom-Header': 'value',
    },
  },
})
```

### 動態選擇模型

```typescript
const agent = new Agent({
  id: 'dynamic-agent',
  name: 'Dynamic Agent',
  model: ({ requestContext }) => {
    const useAdvanced = requestContext.task === 'complex'
    return useAdvanced ? 'deepseek/deepseek-v4-pro' : 'deepseek/deepseek-chat'
  },
})
```

## Provider 選項

DeepSeek 透過 `providerOptions` 參數支援以下 Provider 特有選項：

```typescript
const response = await agent.generate('Hello!', {
  providerOptions: {
    deepseek: {
      // See available options in the table below
    },
  },
})
```

### 可用選項

**thinking** (`{ type?: "adaptive" | "enabled" | "disabled" | undefined; } | undefined`)

**reasoningEffort** (`"low" | "medium" | "high" | "xhigh" | "max" | undefined`)

**strictJsonSchema** (`boolean | undefined`)