Ask a computer scientist, continental philosopher, and anthropologist what "reason" is and they will give you extremely different answers.
If by reason we mean deductive reasoning as practiced in mathematics and inductive reasoning as practiced in the sciences, there is no evidence that LLMs do anything of the sort. There is no reason (ha) to believe that linguistic pattern matching is enough to emulate all that we call thinking in man. To claim so is to adopt an drastically narrow definition of "thinking" and to ignore the fact that we are embodied intellects, capable of knowing ourselves in a transparent possibly prelinguistic way. Unless an AI becomes embodied and can do the same, I have no faith that it will ever "think" or "reason" as humans do. It remains a really good statistical parlor trick.