What's the software people use to make AI art/self portraits?

I know you have apps that do this. But what's the actual API or software used to do this?

For example.... i know that the Open AI website gives you access to chat GPT, for instance. What is the equivalent company software for making ai art? (Sorry if this is difficult to understand)

EDIT: think of those AI that can draw a picture of you in different artstyles

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