I took an IQ exam in grade school. Went fine until I encountered a number sequence, what is the next number kind of thing. I found a pattern, and it's predicted number was not listed as possible choices. That was total crap. I got vexed and then tried to answer the last 3/4 of the test wrong. Parents were later told I was gifted. (Maybe they meant it as euphemism! Ha!). I later learned of a little-known proof that for every sequence, there are infinite number of correct next-numbers. So the test was flawed. As an adult I took a High IQ test and scored 179. (I still dont' grok epsilon-delta proofs and probably never will). I was tested in college against an IQ test and broke it by solving the unsolvable portion through a stochastic technique. He had to go back to his original assumptions.

I'd say, as a group, those with a higher IQ than another group from a random selection of a normally distributed population, they can be expected to perform better on mental tasks that we care about. But at the individual level? Meaningless. Feynman was ~120. I, who have not contributed to anything like quantum physics scored higher, much higher.

For AI, an IQ test is interesting, but I would randomize the temperature (and other knobs) and take lots of samples. Keep in mind a relatively low IQ can blow away an AI on all kinds of things like compassion, understanding the pains of the human condition, self-sacrifice, etc. (etc. means a whole book could be worth exploring).