The AI Assistant in JetBrains is the best I've encountered. In Pycharm, specifically.

I've tried using my OpenAI subscription directly to use GPT4, but copy-pasting between the browser and the lack of context (that GPT has of my code) is limiting.

I've tried Copilot, but it just produces large amounts of junk code, and it gets irritating.

JetBrain's AI Assistant is built into the IDE I use, it melds well with all the pre-existing coding assistance it offers, the conversation interface is useful and can answer questions on specific parts of code (I habitually highlight whatever I'm interested in and ask it about that), and it's good when I ask it to write tests.