That’s an area where they genuinely suck, unless there is an exact wikipedia article on the topic, readily within its training data set.

If you wander off of that knowledge sphere, and you are not sufficiently knowledgeable yourself about the topic, it can tell you some really stupid stuff.

Nonetheless, I do use it quite regularly in everyday life, as it is basically the best reverse dictionary (that works for any language) there is. For work (programming), I didn’t find a better use case than sometimes passing it a list of stuff, giving it an example on the first element on what I want, and using it to generate it for the rest of the elements.

But that is <1% of what I do each day.