Well, I get impressive results with Kiro [0] by AWS. It's specs-based but takes a lot longer than just generating a whole working program with a single prompt. GitHub has their Spec Kit [1] and there's OpenSpec [2] now, so, things will get better.

[0]: https://kiro.dev/

[1]: https://github.com/github/spec-kit

[2]: https://openspec.dev/