Is it possible to change the model to a custom model?

Is it possible to change the model to a custom model, like: https://chatgpt.com/g/g-rmdbtMF7a-expedia , or only the base 3.5 turbo is possible for chatting?

This is effectively a wrapper for the openai javascript package, so this would really be a question to them. I found this list of supported models in their repo

https://github.com/openai/openai-node/blob/master/src/resources/shared.ts

Here is the npm package
https://www.npmjs.com/package/openai