> ## Documentation Index
> Fetch the complete documentation index at: https://docs.requesty.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# OpenAI

> Learn how to use Requesty with the OpenAI SDK

Using Requesty with the OpenAI SDK is as simple as changing a single line of code. By pointing the `base_url` to the Requesty router, you can take advantage of all of Requesty's features without changing the rest of your code.

This simple change unlocks powerful features, such as:

* [Fallback Policies](/features/fallback-policies)
* [Load Balancing](/features/load-balancing)
* [Auto Caching](/features/auto-caching)
* [Request Metadata](/features/request-metadata)
* ...and many more.

All of this is available while maintaining the familiar OpenAI SDK interface.

With Requesty, you can access over 250+ models from various providers. To specify a model, you must include the provider prefix, like `openai/gpt-4.1-mini` or `anthropic/claude-sonnet-4-20250514`. You can find the full list of available models in the [Model Library](https://app.requesty.ai/model-list).

## Python

To use the OpenAI Python client with Requesty, simply set the `base_url` when initializing the client.

```python theme={"dark"}
import openai

# Safely load your API key from environment variables or a secret manager
requesty_api_key = "YOUR_REQUESTY_API_KEY"

client = openai.OpenAI(
    api_key=requesty_api_key,
    base_url="https://router.requesty.ai/v1",
)

# Now you can use the client as you normally would
# All requests will be routed through Requesty
response = client.chat.completions.create(
    model="openai/gpt-4o",
    messages=[{"role": "user", "content": "Hello, world!"}],
)

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

## Javascript

The same principle applies to the OpenAI Javascript client. Set the `baseURL` during initialization.

```javascript theme={"dark"}
import OpenAI from 'openai';

const client = new OpenAI({
  // Safely load your API key from environment variables
  apiKey: "YOUR_REQUESTY_API_KEY",
  baseURL: "https://router.requesty.ai/v1",
});

async function main() {
  // Now you can use the client as you normally would
  // All requests will be routed through Requesty
  const response = await client.chat.completions.create({
    model: "openai/gpt-4o",
    messages: [{ role: "user", content: "Hello, world!" }],
  });

  console.log(response.choices[0].message.content);
}

main();
```