There are some but not a lot, current AI is a lot better focusing on smaller more well-defined problems than stuff like "add this feature" or "fix this bug".

A good example is this PR for llama.cpp which the author says was written 99% by AI. https://github.com/ggerganov/llama.cpp/pull/11453

When the problem statement can be narrowed down to "Here is some code that already produces a correct result, optimize it as much as possible" then the AI doesn't need to understand any context specific to your application at all and the chance it will produce something usable is much higher.

Maybe it will eventually be better at big picture stuff but for now I don't see it.