I find it very hard to believe anyone could code anything complicated with Claude that 5-6 competent developers could do.
I am currently working on a relatively complicated UI on an internal tool and Claude constantly just breaks it. I tried asking it to build it step by step, adding each functionality I need piece by piece. But the code it eventually got was complete garbage. Each new feature it added would break an existing one. It was averse to refactoring the code to make it easier to add future features. I tried to point it in the right direction and it still failed.
It got to the point where I took a copy of the code, cut it back to basics and just wrote it myself. I basically halved the amount of code it wrote, added a couple of extra features and it was human readable. And if I started with this, it would have took less time!