Opus vs Xcode

An old Xcode project of mine was crashing Xcode 27 and I had no idea how to fix it. Usually at this point I'd spend three hours debugging this. Instead, I asked Claude Opus 5.5 to figure out why my Xcode was crashing. It didn't manage to fix it the first time, but on a second attempt, it correctly identified a problem with an xcodeproj setting that was causing it screw up a file.