Earlier quoted context omitted.
Nobody can know, but I think it is fairly clearly possible without signs of sentience that we would consider obvious and indisputable. The definition of 'intelligence' is bearing a lot of weight here, though, and some people seem to favour a definition that makes 'non-sentient intelligence' a contradiction.
As far as I know, and I'm no expert in the field, there is no known example of intelligence without sentience. Actual AI is basically algorithm and statistics simulating intelligence.
If I ask a human to do that and they produce a similar response, does it mean the human is merely simulating intelligence? Or that their reasoning and outputs were similar but the human was aware of their surroundings and worrying about going to the dentist at the same time, so genuinely intelligent?
There is no formal definition to snap to, but I’d argue “intelligence” is the ability to synthesize information to draw valid conclusions. So, to me, LLMs can be intelligent. Though they certainly aren’t sentient.