There's two sides to efficiency: one of them is how much you put in and the other is how much you get out. I was asking the question because the answer of the relative efficiency of a human vs an LLM strongly depends on what you put on either side of the equation. It's a really easy pitfall to look at one side of one version of that equation and presume a really high inefficiency when that's not necessarily the case. It doesn't help that the data necessary to fully answer any version of this isn't publicly available. That's why I was asking for something more concrete in terms of how you were making the comparison.
If you're looking at training costs, there is definitely one aspect in which LLMs are obviously significantly less efficient: the amount of information needed for the initial training. This does translate into some pretty high costs but it only needs to be paid once for the amount of work that any given LLM does. In terms of fine-tuning LLMs can get significantly more data-efficient than the initial model, which also means energy-efficient, and it's not obvious to me that it would be drastically worse than a human (though again, only thinking in terms of doing the energy input for the kind of work that an LLM is good at).
(The increased efficiency in comparison to humans is part of the reason why you see Jevon's paradox mentioned a lot whenever concerns about the resources used by LLMs are mentioned: more efficiency can easily mean more resource use in total)
If you're looking at training costs, there is definitely one aspect in which LLMs are obviously significantly less efficient: the amount of information needed for the initial training. This does translate into some pretty high costs but it only needs to be paid once for the amount of work that any given LLM does. In terms of fine-tuning LLMs can get significantly more data-efficient than the initial model, which also means energy-efficient, and it's not obvious to me that it would be drastically worse than a human (though again, only thinking in terms of doing the energy input for the kind of work that an LLM is good at).
(The increased efficiency in comparison to humans is part of the reason why you see Jevon's paradox mentioned a lot whenever concerns about the resources used by LLMs are mentioned: more efficiency can easily mean more resource use in total)