The OpenAI model to use.<br />
`NLUX` only supports **chat completion models** such as `gpt-3.5-turbo` and `gpt-4-0314`.<br />
You can find a list of available models [here](https://platform.openai.com/docs/models).

* Method: `withModel(model)`
* Argument Type: `string`
* Required: `false`
* Usage:

```js
const adapter = createUnsafeChatAdapter()
    .withModel('gpt-4-32k');
```
