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What does LLM need to do for you to consider it "smart"? To me they seem to be pretty damn smart, to put it mildly. They sometimes do stupid things - but so do smart people!
They aren’t smart, they approximate language constructs. They don’t have believes, ideas, etc. but have a few rounds of discussions with any LLMs and you see how they are probabilistic autocompletes based on whatever patterns from rounds of discussions you feed them
Clearly there's a limit. For example, if an alien autocomplete implementation were to fall out of a wormhole that somehow manages to, say, accurately complete sentences like "S&P 500, :" with tomorrow's actual closing value today, I'd call that something else.