I had to optimize some Python code to reduce its memory usage. After trying all ideas I could think of, I thought about rewriting it in a different language. Copied and pasted the code into ChatGPT 4. Tried Rust at first, but there were too many compilation errors. Then I tried Go and it worked perfectly. For the next couple of weeks, I used it to improve the Go code, as I've never used Go. It gave me great answers, I think maybe once or twice the code didn't compile (I used it dozens of times per day).

I'm now using the optimized Go code in production.