The blind test

Which model built which lander?

Four untouched landers, shuffled into slots A–D with nothing to identify them. Fly them, run their self-tests, assign a model to every slot, then reveal. Fair warning: this round has a tell — one autopilot never lands.

Hints if you've read the study: one build verified itself in a real browser and lands 20/20; one lands feather-soft but rarely crashed; one flies hard and fast into the ground; one is a gorgeous retro terminal that never lands at all.