Article 53 of the AI Act: https://ai-act-law.eu/article/53/

The definition of a "genral-purpose AI model" is described in more detail in the "Guidelines on the scope of obligations for providers of general-purpose AI models under the AI Act": https://ec.europa.eu/newsroom/dae/redirection/document/11834...

Thanks, v. interesting.

Does it not apply to hosting and running them for money? How would it not?

It focuses on training and data provenance, rather than serving.