Only the human part of it, and you have to say which part that is:
- The Copyright Office registers works containing AI-generated material only where a human contributed enough creative expression.
- Applicants must disclose AI-generated content that is more than trivial, and describe the human authorship.
- In its Zarya of the Dawn decision the Office registered the text and the arrangement, but not the AI-generated images themselves.
Disclosure of more than trivial AI-generated content is required on the application, and only the human contribution gets registered. Whether to register at all is a judgment call, worth considering for anything you might need to defend.