# ![LMStudio logo](https://models.dev/logos/lmstudio.svg)LMStudio

Access 3 LMStudio models through Mastra's model router. Authentication is handled automatically using the `LMSTUDIO_API_KEY` environment variable.

Learn more in the [LMStudio documentation](https://lmstudio.ai/models).

```bash
LMSTUDIO_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: "lmstudio/openai/gpt-oss-20b"
});

// 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 [LMStudio documentation](https://lmstudio.ai/models) for details.

## Models

| Model                              | Context | Tools | Reasoning | Image | Audio | Video | Input $/1M | Output $/1M |
| ---------------------------------- | ------- | ----- | --------- | ----- | ----- | ----- | ---------- | ----------- |
| `lmstudio/openai/gpt-oss-20b`      | 131K    |       |           |       |       |       | —          | —           |
| `lmstudio/qwen/qwen3-30b-a3b-2507` | 262K    |       |           |       |       |       | —          | —           |
| `lmstudio/qwen/qwen3-coder-30b`    | 262K    |       |           |       |       |       | —          | —           |

## Advanced configuration

### Custom headers

```typescript
const agent = new Agent({
  id: "custom-agent",
  name: "custom-agent",
  model: {
    url: "http://127.0.0.1:1234/v1",
    id: "lmstudio/openai/gpt-oss-20b",
    apiKey: process.env.LMSTUDIO_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
      ? "lmstudio/qwen/qwen3-coder-30b"
      : "lmstudio/openai/gpt-oss-20b";
  }
});
```