OpenAI API key with GPT4 plus aider[1]: https://github.com/paul-gauthier/aider For reference against the actual product called “Copilot”, I would say this is actually useful, vs Copilot which I would use words like “glorified autocomplete” and “slightly better intellisense” to describe. Only really good for saving you some rote typing periodically. The primary limit with “aider” is the GPT4 context window, so really…
The output is more or less of similar quality as far as I can tell. However, what makes me like Sourcegraph's Cody more is the more advanced interface it gives me in VSCode. It allows me to do all the things I want (get quick answers to code-related questions, refactor code, write tests, and explain code that's confusing) all one hot key away.