Cursor vs Claude Code for vibe coding: a real head-to-head

We gave each $20 agent the same founder pitch and the same pass-or-fail gates, frozen before either run started, then did it again with a completely different product to break the tie. Round one: 11/12 each, same failure. Round two: 12/12 each. Two builds, two ties. Here is what still separates them, receipts and repos included.