I need to try it out. I have been using a mixture of the Copilot plugin for autocomplete and then a third party package that uses an API key for OpenAI. I enjoy the third party package because I can just use 3.5/4 directly with my own system prompt instead of the garbage interface for Copilot or ChatGPT directly.

Edit: Just tried it out again, honestly pretty disappointing. It works and good they released it, Github has been ignoring the Jetbrains experience. Their implementation has bloated UI and I don't like the way they handle prewritten prompts.

I really like this implementation. https://github.com/didalgolab/chatgpt-intellij-plugin