Python, works quite well, golang works super well. C++ and JS are reasonable. Rust, you might as well turn it off. The more popular the language overall, the better it does. Swift and Kotlin might have too little to have refined the model on.

Another thing: I was using the free version in beta so it was effectively the full blown version. It worked super well. I changed jobs, changed hardware, and haven't set up my key yet (hopefully still grandfathered in) but it's felt not as good - the output is a lot shorter, for one. I would likely get the paid version if I lose my beta key. But it's weird that you have the paid version and it's not useful.

It's also possible they nerfed the models over time in the name of some other tradeoff, like cpu or memory. May still be able to configure it. But I distinctly remember it spitting out entire lines or chunks of code, exactly as I would have written them.

It works best when you are writing stuff similar to your own codebase. Perhaps try vendoring some Swift or Kotlin in your project dir to get the engine to fine-tune on it?