I've used it to figure out a button on a vintage calculator which had multiple humans give up assuming it's broken. Neither I, nor the AI knew what it was for but I could use it as a very willing conversation partner that didn't grow tired of trying new things.

I've had it help me come up with an effective deep fry batter that fit my exact needs and gave a perfect result.

It's usefulness is limited in many respects but if you have a rough idea of what you're talking about it will (mostly) be helpful. Until it forgets things.