I've found that GPT4 is particularly good at generating TCL code. Possibly because what's out there is generally high-quality, possibly because there's very little syntax for it to keep track of.

GPT-4 is fantastic as one-off scripts for any task.

It can produce scripts in seconds that might have taken technical support people an entire day (stretched to a week or more of work) prior.

Of course, it can't maintain a codebase like a professional developer can. Thank God.

Well duh, that's not what you use it for. You use it to generate parts and snippets quicker.