I suppose that for me the tool rarely contributes to the design and execution. At work and for any project I care about, I prompt once I know what I want, in terms of both function and the shape of the program to do it. If the model gen matches the shape closely enough, I accept, otherwise iterate from there. To me this is authorship.

When I vibe code - which for me, means using very high level prompts and largely not reading the output - then I could see attributing authorship to a model; but then I wonder what the purpose of authorship attribution is to begin with. Is it to tell you who to talk to about the code? Is it personal attestation to quality, or to responsibility? Is it credit? Some combination of these certainly, but AI can hold none except the last, and the last is, to me, rather pointless. Objects don't have feelings and therefore are unaffected by whether credit is given or not; that's purely a human concern.

I suppose the dividing line is fuzzy and perhaps best judged on the basis of the obscenity rule, that is, I know it when I see it.