Access 20 AgentRouter models through Mastra's model router. Authentication is handled automatically using the `AGENTROUTER_API_KEY` environment variable.

Learn more in the [AgentRouter documentation](https://docs.agentrouter.org/).

```bash
AGENTROUTER_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: "agentrouter/claude-3-5-haiku-20241022"
});

// 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);
}
```

Mastra uses the OpenAI-compatible `/chat/completions` endpoint. Some provider-specific features may not be available. Check the [AgentRouter documentation](https://docs.agentrouter.org/) for details.

## Models

| Model | Context | Tools | Reasoning | Image | Audio | Video | Input $/1M | Output $/1M |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| `agentrouter/claude-3-5-haiku-20241022` | 200K |  |  |  |  |  | $1 | $5 |
| `agentrouter/claude-3-5-sonnet-20240620` | 200K |  |  |  |  |  | $3 | $15 |
| `agentrouter/claude-3-5-sonnet-20241022` | 200K |  |  |  |  |  | $3 | $15 |
| `agentrouter/claude-3-7-sonnet-20250219` | 200K |  |  |  |  |  | $3 | $15 |
| `agentrouter/claude-3-7-sonnet-20250219-thinking` | 200K |  |  |  |  |  | $3 | $15 |
| `agentrouter/claude-haiku-4-5-20251001` | 200K |  |  |  |  |  | $2 | $4 |
| `agentrouter/claude-opus-4-20250514` | 200K |  |  |  |  |  | $21 | $105 |
| `agentrouter/claude-opus-4-20250514-thinking` | 200K |  |  |  |  |  | $2 | $10 |
| `agentrouter/claude-sonnet-4-20250514` | 200K |  |  |  |  |  | $3 | $15 |
| `agentrouter/claude-sonnet-4-20250514-thinking` | 200K |  |  |  |  |  | $2 | $10 |
| `agentrouter/claude-sonnet-4-5-20250929` | 1.0M |  |  |  |  |  | $6 | $30 |
| `agentrouter/deepseek-r1-0528` | 128K |  |  |  |  |  | $0.30 | $0.04 |
| `agentrouter/deepseek-v3.1` | 128K |  |  |  |  |  | $0.30 | $0.04 |
| `agentrouter/deepseek-v3.2` | 128K |  |  |  |  |  | $0.30 | $0.04 |
| `agentrouter/gemini-3-pro-preview` | 1.0M |  |  |  |  |  | $2 | $8 |
| `agentrouter/glm-4.5` | 131K |  |  |  |  |  | $0.00 | — |
| `agentrouter/glm-4.6` | 205K |  |  |  |  |  | $0.00 | — |
| `agentrouter/gpt-5` | 1.3M |  |  |  |  |  | — | — |
| `agentrouter/gpt-5.1` | 400K |  |  |  |  |  | $2 | $2 |
| `agentrouter/kimi-k2-thinking` | 262K |  |  |  |  |  | $0.00 | — |

20 available models

## Advanced Configuration

### Custom Headers

```typescript
const agent = new Agent({
  id: "custom-agent",
  name: "custom-agent",
  model: {
    url: "https://agentrouter.org/v1",
    id: "agentrouter/claude-3-5-haiku-20241022",
    apiKey: process.env.AGENTROUTER_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
      ? "agentrouter/kimi-k2-thinking"
      : "agentrouter/claude-3-5-haiku-20241022";
  }
});
```