I had an opportunity today that made it useful. I was trying to find a reliable method of counting the decimal places in a double (64 bit float). I couldn't help but feeling like the responses were not quite informed and possibly dangerous.

Chat GPT provided a solution, one that appeared better than most of what I had seen in the previous 15-30 minutes. I asked it twice to ensure safety and it improved its response.

I then asked it to explain a particular choice and it was thorough enough for me to feel comfortable. In the end I feel like it understood its reasoning better than some of the options I saw on SO.

This was GPT-4 and a fairly simple problem that was benefited by its understanding of the double type.