> Discover all available pages from the documentation index: https://mastra.ai/llms.txt

# ![CoralBricks logo](https://models.dev/logos/coralbricks.svg)CoralBricks

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

Learn more in the [CoralBricks documentation](https://www.coralbricks.ai/docs).

```bash
CORAL_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: "coralbricks/glm-5.2-fp4"
});

// 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);
}
```

> **Note:** Mastra uses the OpenAI-compatible `/chat/completions` endpoint. Some provider-specific features may not be available. Check the [CoralBricks documentation](https://www.coralbricks.ai/docs) for details.

## Models

| Model                      | Context | Tools | Reasoning | Image | Audio | Video | Input $/1M | Output $/1M |
| -------------------------- | ------- | ----- | --------- | ----- | ----- | ----- | ---------- | ----------- |
| `coralbricks/glm-5.2-fp4`  | 1.0M    |       |           |       |       |       | $1         | $4          |
| `coralbricks/gpt-oss-120b` | 131K    |       |           |       |       |       | $0.12      | $0.60       |
| `coralbricks/kimi-k3`      | 1.0M    |       |           |       |       |       | $3         | $15         |

## Advanced configuration

### Custom headers

```typescript
const agent = new Agent({
  id: "custom-agent",
  name: "custom-agent",
  model: {
    url: "https://inference.coralbricks.ai/v1",
    id: "coralbricks/glm-5.2-fp4",
    apiKey: process.env.CORAL_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
      ? "coralbricks/kimi-k3"
      : "coralbricks/glm-5.2-fp4";
  }
});
```