It is interesting to see that in a time when a lot of people accept the theory of materialism for the human brain (i.e the view that everything is physical and the mind is a product of brain), the same people tend to have a "hidden" dualist view on LLMs. Suddenly, they claim that what happens in the brain cannot be replicated anywhere else because "something" is lacking, but either they don't say what it is, or it is…
If a LLM says "I am in pain", is it just stringing together words or is it feeling pain? Does pain exist for a being that never felt any kind of physical pain, never had any pain receptors? There are humans who don't have any pain receptors because of genetic mutations. They cut themselves all the time, they bleed, they break bones and they don't seem distressed by it even on a purely mental, intellectual level.
If a human says "I am in pain", is it just stringing together words or is it feeling pain?
If you take that seriously it's quite a tough question to unwind. See e.g. Dennett's heterophenomenology conversations.