The Chomsky hierarchy is a classification of grammars. So it's about Syntax.
GPT is purely about semantics, about truth. To the extent that I think it can be said to be fundamentally informal in its dedication to truth, since it can easily be prompted to produce syntactically incorrect output - wrt the syntax of whatever language whose semantics determine the truth GPT is asked to reflect.
So I think this is a categorically incorrect question.
I mean, what is the fundamental syntax of the output of an LLM? It would have to be that any sequence of utf8 chars is valid.
GPT is purely about semantics, about truth. To the extent that I think it can be said to be fundamentally informal in its dedication to truth, since it can easily be prompted to produce syntactically incorrect output - wrt the syntax of whatever language whose semantics determine the truth GPT is asked to reflect.
So I think this is a categorically incorrect question.
I mean, what is the fundamental syntax of the output of an LLM? It would have to be that any sequence of utf8 chars is valid.