# ![Upstage logo](https://models.dev/logos/upstage.svg)Upstage

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

Learn more in the [Upstage documentation](https://developers.upstage.ai).

```bash
UPSTAGE_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: "upstage/solar-mini"
});

// 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 [Upstage documentation](https://developers.upstage.ai) for details.

## Models

| Model                | Context | Tools | Reasoning | Image | Audio | Video | Input $/1M | Output $/1M |
| -------------------- | ------- | ----- | --------- | ----- | ----- | ----- | ---------- | ----------- |
| `upstage/solar-mini` | 33K     |       |           |       |       |       | $0.15      | $0.15       |
| `upstage/solar-pro2` | 66K     |       |           |       |       |       | $0.25      | $0.25       |
| `upstage/solar-pro3` | 131K    |       |           |       |       |       | $0.25      | $0.25       |

## Advanced configuration

### Custom headers

```typescript
const agent = new Agent({
  id: "custom-agent",
  name: "custom-agent",
  model: {
    url: "https://api.upstage.ai/v1/solar",
    id: "upstage/solar-mini",
    apiKey: process.env.UPSTAGE_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
      ? "upstage/solar-pro3"
      : "upstage/solar-mini";
  }
});
```