It's really more like a smarter autocomplete. I haven't tried it on a third party API yet, we don't use many at work. I work in a startup on a Python and TypeScript code base. To give an example, last night I was creating a unit test and copilot filled in the assertions. It missed one it couldn't know about, and it got two wrong. But it was a lot faster. The most amazing case to me was with a function to transform URLs to an image resize service. There was a bug in the function, it needed to return URLs ending in .SVG as-is. I went to fix the bug by typing "if" and copilot filled in the `if url.lower().endswith(".svg") return url`. It knew about the bug before I did. Too bad it couldn't do a code review when I originally wrote the function.

They have a 60 day free trial. Try it out, it's one of the most interesting changes in developer tools in a while. I feel like I'm living in the future sometimes when using it.