I don't know what it built for you in 5 minutes, probably something that "works".
I have spent two weeks using opus just to write a plan/design for 2FA and iron it out until review (about 7 of them) doesn't flag it with 20+ problems (with security holes of various sizes), for which I had to guide it through to not turn it into a mess and whac-a-mole.
I have spent two weeks using opus just to write a plan/design for 2FA and iron it out until review (about 7 of them) doesn't flag it with 20+ problems (with security holes of various sizes), for which I had to guide it through to not turn it into a mess and whac-a-mole.