I was writing a sudoku solver today and there was a bug that took me a while to track down (can't remember exactly how long - could be a few minutes to a couple of hours).

I asked ChatGPT to find the bug and it didn't find it. I also asked GPT4-Turbo to find the bug and it also couldn't find it. In the end I found the bug manually using tracing prints.

After I found the bug, I wondered if GPT4 could have found it so I gave the buggy code to GPT4 and it found the line with the bug instantly.

To me this shows that GPT4 is much better than GPT4-Turbo and GPT-3.5