I wrote a blog post comparing Cody to Copilot a little while ago. Some of the stuff might be outdated now, but I think it still captures the essence of the differences between the two. Obviously I'm a little biased as I work for Sourcegraph, but I tried to be as fair as one could be. Happy to dive deeper into any details. https://sourcegraph.com/blog/copilot-vs-cody-why-context-mat...
Our biggest differentiators are context, choice, and scale. We've been helping developers find and understand code for the last 10 years and are now applying a lot of that to Cody in regards to fetching the right context. When it comes choice, we support multiple LLMs and are always on the lookout in supporting the right LLM for the job. We recently rolled out Claude 3 Opus as well as Ollama support for offline/local inference.
Cody also has a free tier where you can give it a try and compare for yourself, which is what I always recommend people do :)
Correct url: https://sourcegraph.com/blog/copilot-vs-cody-why-context-mat...
I ended up disabling copilot. The reason is that the completions do not always integrate with the rest of the code, in particular with non-matching brackets. Often it just repeats some other part of the code. I had much fewer cases of this with Cody. But, arguably, the difference is not huge. But then add on top of this choice of models.
For instance, I'd often get a problem where I'd type "foo(", and VsCode would auto-close the parenthesis, so my cursor would be in "foo(|)", but Copilot wouldn't be aware of the auto-close, so it would suggest "bar)" as a completion, leading to "foo(bar))" if I accepted it. But I haven't had this problem in recent versions. Other similar papercuts I'd noticed have been fixed.
I haven't used Cody, though, so I don't know how they compare.
In particular, Copilot seems to do better at generating missing TypeScript import statements. These are relative imports of files in the same small repo. Neither of them seems to really understand my codebase in the way that Cody promises - they make up imports of nonexistent files. Copilot sometimes guesses the right file, I think based on my understanding my naming conventions better.