# ![xAI logo](https://models.dev/logos/xai.svg)xAI

Access 25 xAI models through Mastra's model router. Authentication is handled automatically using the `XAI_API_KEY` environment variable.

Learn more in the [xAI documentation](https://docs.x.ai/docs/models).

```bash
XAI_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: "xai/grok-2"
});

// 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);
}
```

## Models

| Model                              | Context | Tools | Reasoning | Image | Audio | Video | Input $/1M | Output $/1M |
| ---------------------------------- | ------- | ----- | --------- | ----- | ----- | ----- | ---------- | ----------- |
| `xai/grok-2`                       | 131K    |       |           |       |       |       | $2         | $10         |
| `xai/grok-2-1212`                  | 131K    |       |           |       |       |       | $2         | $10         |
| `xai/grok-2-latest`                | 131K    |       |           |       |       |       | $2         | $10         |
| `xai/grok-2-vision`                | 8K      |       |           |       |       |       | $2         | $10         |
| `xai/grok-2-vision-1212`           | 8K      |       |           |       |       |       | $2         | $10         |
| `xai/grok-2-vision-latest`         | 8K      |       |           |       |       |       | $2         | $10         |
| `xai/grok-3`                       | 131K    |       |           |       |       |       | $3         | $15         |
| `xai/grok-3-fast`                  | 131K    |       |           |       |       |       | $5         | $25         |
| `xai/grok-3-fast-latest`           | 131K    |       |           |       |       |       | $5         | $25         |
| `xai/grok-3-latest`                | 131K    |       |           |       |       |       | $3         | $15         |
| `xai/grok-3-mini`                  | 131K    |       |           |       |       |       | $0.30      | $0.50       |
| `xai/grok-3-mini-fast`             | 131K    |       |           |       |       |       | $0.60      | $4          |
| `xai/grok-3-mini-fast-latest`      | 131K    |       |           |       |       |       | $0.60      | $4          |
| `xai/grok-3-mini-latest`           | 131K    |       |           |       |       |       | $0.30      | $0.50       |
| `xai/grok-4`                       | 256K    |       |           |       |       |       | $3         | $15         |
| `xai/grok-4-1-fast`                | 2.0M    |       |           |       |       |       | $0.20      | $0.50       |
| `xai/grok-4-1-fast-non-reasoning`  | 2.0M    |       |           |       |       |       | $0.20      | $0.50       |
| `xai/grok-4-fast`                  | 2.0M    |       |           |       |       |       | $0.20      | $0.50       |
| `xai/grok-4-fast-non-reasoning`    | 2.0M    |       |           |       |       |       | $0.20      | $0.50       |
| `xai/grok-4.20-0309-non-reasoning` | 2.0M    |       |           |       |       |       | $2         | $6          |
| `xai/grok-4.20-0309-reasoning`     | 2.0M    |       |           |       |       |       | $2         | $6          |
| `xai/grok-4.20-multi-agent-0309`   | 2.0M    |       |           |       |       |       | $2         | $6          |
| `xai/grok-beta`                    | 131K    |       |           |       |       |       | $5         | $15         |
| `xai/grok-code-fast-1`             | 256K    |       |           |       |       |       | $0.20      | $2          |
| `xai/grok-vision-beta`             | 8K      |       |           |       |       |       | $5         | $15         |

## Advanced configuration

### Custom headers

```typescript
const agent = new Agent({
  id: "custom-agent",
  name: "custom-agent",
  model: {
    id: "xai/grok-2",
    apiKey: process.env.XAI_API_KEY,
    headers: {
      "X-Custom-Header": "value"
    }
  }
});
```

### Dynamic model selection

```typescript
const agent = new Agent({
  id: "dynamic-agent",
  name: "Dynamic Agent",
  model: ({ requestContext }) => {
    const useAdvanced = requestContext.task === "complex";
    return useAdvanced
      ? "xai/grok-vision-beta"
      : "xai/grok-2";
  }
});
```

## Provider Options

xAI supports the following provider-specific options via the `providerOptions` parameter:

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

### Available Options

**reasoningEffort** (`"low" | "high" | undefined`)

**parallel\_function\_calling** (`boolean | undefined`)

**searchParameters** (`{ mode: "off" | "auto" | "on"; returnCitations?: boolean | undefined; fromDate?: string | undefined; toDate?: string | undefined; maxSearchResults?: number | undefined; sources?: ({ ...; } | ... 2 more ... | { ...; })[] | undefined; } | undefined`)

## Direct provider installation

This provider can also be installed directly as a standalone package, which can be used instead of the Mastra model router string. View the [package documentation](https://www.npmjs.com/package/@ai-sdk/xai) for more details.

**npm**:

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

**pnpm**:

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

**Yarn**:

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

**Bun**:

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

For detailed provider-specific documentation, see the [AI SDK xAI provider docs](https://ai-sdk.dev/providers/ai-sdk-providers/xai).