# Optional headers for OpenRouter leaderboard
headers = {
    "HTTP-Referer": "YOUR_SITE_URL",  # Optional. Site URL for rankings
    "X-Title": "YOUR_SITE_NAME"  # Optional. Site title for rankings
}

response = client.chat.completions.create(
    model="openai/gpt-4",  # You can use any model available on OpenRouter
    extra_headers=headers,
    messages=[
        {"role": "user", "content": "Hello, world!"}
    ],
    temperature=0.7,
    max_tokens=100
)

print(response.choices[0].message.content)
```

## Available Models

OpenRouter provides access to a wide variety of models, including many open source models from different providers.

* [OpenAI models](https://openrouter.ai/openai) (GPT-4o, o1, o3-mini)
* [Anthropic models](https://openrouter.ai/anthropic) (Opus, Sonnet, Haiku)
* [Google models](https://openrouter.ai/google) (Gemini Pro, Flash, Flash Thinking)
* And many open source models

You can find the complete list of available models in the [OpenRouter documentation](https://openrouter.ai/models).

## Supported Methods

OpenRouter supports the following methods:

### Chat Completions

* `client.chat.completions.create()`: Works with all models
* Provides standard chat completion functionality
* Compatible with the OpenAI SDK interface

### Structured Outputs

* `client.beta.chat.completions.parse()`: Only compatible with OpenAI models
* For non-OpenAI models, see OpenRouter's [Structured Outputs documentation](https://openrouter.ai/docs/features/structured-outputs)

For detailed information about available methods, parameters, and best practices, refer to the [OpenRouter API documentation](https://openrouter.ai/docs).