# ![Llama logo](https://models.dev/logos/llama.svg)Llama

Access 7 Llama models through Mastra's model router. Authentication is handled automatically using the `LLAMA_API_KEY` environment variable.

Learn more in the [Llama documentation](https://llama.developer.meta.com/docs/models).

```bash
LLAMA_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: "llama/cerebras-llama-4-maverick-17b-128e-instruct"
});

// 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);
}
```

> **Info:** Mastra uses the OpenAI-compatible `/chat/completions` endpoint. Some provider-specific features may not be available. Check the [Llama documentation](https://llama.developer.meta.com/docs/models) for details.

## Models

| Model                                               | Context | Tools | Reasoning | Image | Audio | Video | Input $/1M | Output $/1M |
| --------------------------------------------------- | ------- | ----- | --------- | ----- | ----- | ----- | ---------- | ----------- |
| `llama/cerebras-llama-4-maverick-17b-128e-instruct` | 128K    |       |           |       |       |       | —          | —           |
| `llama/cerebras-llama-4-scout-17b-16e-instruct`     | 128K    |       |           |       |       |       | —          | —           |
| `llama/groq-llama-4-maverick-17b-128e-instruct`     | 128K    |       |           |       |       |       | —          | —           |
| `llama/llama-3.3-70b-instruct`                      | 128K    |       |           |       |       |       | —          | —           |
| `llama/llama-3.3-8b-instruct`                       | 128K    |       |           |       |       |       | —          | —           |
| `llama/llama-4-maverick-17b-128e-instruct-fp8`      | 128K    |       |           |       |       |       | —          | —           |
| `llama/llama-4-scout-17b-16e-instruct-fp8`          | 128K    |       |           |       |       |       | —          | —           |

## Advanced configuration

### Custom headers

```typescript
const agent = new Agent({
  id: "custom-agent",
  name: "custom-agent",
  model: {
    url: "https://api.llama.com/compat/v1/",
    id: "llama/cerebras-llama-4-maverick-17b-128e-instruct",
    apiKey: process.env.LLAMA_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
      ? "llama/llama-4-scout-17b-16e-instruct-fp8"
      : "llama/cerebras-llama-4-maverick-17b-128e-instruct";
  }
});
```