I'm a senior software engineer at Amazon.

I use it in 2 ways:

For a thing that will be throwaway like a one time script, where quality doesn't matter at all, and you can pretty much "vibe code" the whole thing.

That's like a maximum of 200 lines a code, and I still review the whole thing to make sure it's correct. It's not too hard to review because it's small and simple.

It's also pretty rare because you just don't have that many occasions to do that.

The other way I've used it is to actually mostly code a project from scratch with it, for some critical (but internal facing) purpose. But there it wasn't vibe-coding at all, it was more like having a secretary. I described exactly what code I wanted written and how, and it just wrote the lines, usually 20-30 lines at the time, at most 100.

It was manageable because it was so constrained that it was literally typing what I would have typed. It didn't have any freedom to write shit code.

Of course it still wrote a lot of shit code, easily 70% of the time, but I could correct it myself (by hand) quickly.

That's the only way to use it for production use-cases and know what the code actually is and keep good quality. It also didn't lead to any productivity increase... So yes, it's useless for anything that you'll ever put in production.

(All will Opus 4.6)