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# ![Perplexity 標誌](https://models.dev/logos/perplexity.svg)Perplexity

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

如需進一步了解，請參閱[Perplexity 文件](https://docs.perplexity.ai)。

```bash
PERPLEXITY_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: 'perplexity/sonar',
})

// 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 |
| -------------------------------- | ------- | ----- | --------- | ----- | ----- | ----- | ---------- | ----------- |
| `perplexity/sonar`               | 128K    |       |           |       |       |       | $1         | $1          |
| `perplexity/sonar-deep-research` | 128K    |       |           |       |       |       | $2         | $8          |
| `perplexity/sonar-pro`           | 200K    |       |           |       |       |       | $3         | $15         |
| `perplexity/sonar-reasoning-pro` | 128K    |       |           |       |       |       | $2         | $8          |

## 進階設定

### 自訂標頭

```typescript
const agent = new Agent({
  id: 'custom-agent',
  name: 'custom-agent',
  model: {
    id: 'perplexity/sonar',
    apiKey: process.env.PERPLEXITY_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 ? 'perplexity/sonar-reasoning-pro' : 'perplexity/sonar'
  },
})
```

## 直接安裝 Provider

你也可以直接將此 Provider 安裝為獨立套件，用它取代 Mastra 模型路由字串。詳情請參閱[套件文件](https://www.npmjs.com/package/@ai-sdk/perplexity)。

**npm**:

```bash
npm install @ai-sdk/perplexity
```

**pnpm**:

```bash
pnpm add @ai-sdk/perplexity
```

**Yarn**:

```bash
yarn add @ai-sdk/perplexity
```

**Bun**:

```bash
bun add @ai-sdk/perplexity
```

如需此 Provider 的詳細說明，請參閱 [AI SDK Perplexity Provider 文件](https://ai-sdk.dev/providers/ai-sdk-providers/perplexity)。