Its ability to correct itself is very impressive when given the feedback. I imagine with the proper feedback loop it can advance very fast. E.g., when asked to write a piece of html markup, if it could "see" how the rendered layout is different from what was asked for, it could adjust its solution without human involvement. If it could run the deployment script and see where it fails, it could apply all the fixes itself until it works. If it could run the unit tests and see where its solution breaks the other parts of the system, it would need much less handholding.