Custom GPTs don’t support a bunch of newer ChatGPT features like chat history and projects and they can’t be edited from mobile. There is no real advantage to using a custom GPT over adding a custom prompt to a project at this point, given that the latter doesn’t isolate you from the rest of ChatGPT’s feature set. It really seems like they stopped working on custom GPTs and just expect users to use projects instead.

> There is no real advantage to using a custom GPT over adding a custom prompt to a project

The two features, namely Custom GPTs and Projects, are orthogonal. This is because a Project is for related explorations of a theme, whereas a Custom GPT is for unrelated explorations of a theme.

> chat history

What chat history? Each chat is in the user's history by default, which is how it's supposed to work for Custom GPTs. I don't need a filtered chat history for a Custom GPT like I do for a Project.

> It really seems like they stopped working on custom GPTs and just expect users to use projects instead.

That's more a personal belief rather than a conclusion; it's not even a formal declaration by OpenAI.