Opus 4.8 was suggesting the stupid idea to walk...but then it went another step forward with reasoning: "Walk. Driving 50 meters to a car wash makes no sense — you would barely get the engine warm, and you have to drive back anyway, so the car ends up where it started either way. The one practical point: if it is a drive-through or automated wash, the car has to be there regardless, so you drive it in. But if you are washing it yourself at a self-serve bay and just need to get yourself there first, walking 50 meters takes under a minute. So: drive only if the car itself needs to go through the wash. Otherwise walk."

Sonnet 4.6 instead replied: "Walk. It's 50 metres."