# OpenAI

## Implementation

### Provider Setup

```typescript
import OpenAI from 'openai';

class OpenAIProvider implements LLMProvider {
  private client: OpenAI;

  constructor() {
    this.client = new OpenAI({
      apiKey: process.env.OPENAI_API_KEY,
    });
  }
}
```

### Message Generation

```typescript
async generateResponse(
  messages: Array<{ role: string; content: string }>
): Promise<LLMResponse> {
  const formattedMessages = messages.map(msg => ({
    role: msg.role as 'user' | 'assistant' | 'system',
    content: msg.content
  }));

  // Implementation details
}
```

## Function Calling

### Available Functions

```typescript
const functions = {
  generate_image: {
    name: "generate_image",
    description: "Generate an image based on the prompt",
    parameters: {
      type: "object",
      properties: {
        prompt: {
          type: "string",
          description: "The description of the image to generate"
        }
      },
      required: ["prompt"]
    }
  },
  get_weather: {
    name: "get_weather",
    description: "Get current weather data",
    parameters: {
      type: "object",
      properties: {
        location: {
          type: "object",
          description: "Location details",
          properties: {
            name: { type: "string" },
            country: { type: "string" },
            coordinates: {
              type: "object",
              properties: {
                lat: { type: "number" },
                lon: { type: "number" }
              }
            }
          }
        }
      }
    }
  }
}
```

## Error Handling

### Common Errors

* Rate limiting
* Content policy violations
* Token limits
* Invalid requests

### Error Response Format

```typescript
interface ErrorResponse {
  error: true;
  content: string;
  type?: string;
  retryAfter?: number;
}
```

## Best Practices

### Configuration

* Use environment variables for API keys
* Configure request timeouts
* Set appropriate temperature
* Manage token limits

### Message Handling

* Validate message roles
* Clean input content
* Format system prompts
* Handle streaming properly

### Security

* Secure API key storage
* Input validation
* Response sanitization
* Error masking

## Related Documentation

* [LLM Factory](https://docs.lillo.ai/llm/factory)
* [Function Calling](https://github.com/lillo-ai/website/blob/master/docs/core/llm/function-calling.md)
* [API Reference](https://github.com/lillo-ai/website/blob/master/docs/reference/api.md)