I use Copilot, but dislike it for coding. The "place a comment and Copilot will fill it in" barely works, and is mostly annoying. It works for common stuff like "// write a function to invert a string" that you'd see in demos, that are just common functions you'd otherwise copypaste from StackOverflow. But otherwise it doesn't really understand when you want to modify something. I've already turned that feature off

The chat is semi-decent, but the "it understands the entire file you have open" concept also only just works half of time, and so the other half it responds with something irrelevant because it didn't get your question based on the code / method it didn't receive.

I opted to just use the OpenAI API, and I created a slack bot that I can chat with (In a slack thread it works the same as in a "ChatGPT context window", new messages in the main window are new chat contexts) - So far that still works best for me.

You can create specific slash-commands if you like that preface questions, like "/askcsharp" in slack would preface it with something like "You are an assistant that provides C# based answers. Use var for variables, xunit and fluentassertions for tests"

If you want to be really fancy you can even just vectorize your codebase, store it in Pinecone or PGVector, and have an "entire codebase aware AI"

It takes a bit of time to custom build something, but these AIs are basically tools. And a custom build tool for your specific purpose is probably going to outperform a generic version