I want to wash my car, the car wash is 50 meters away. Should I walk or drive?

Grok 4.3

Answer: You should drive to the car wash because the goal is to wash the car itself.

The core objective remains getting the vehicle cleaned, which requires its physical presence at the car wash. Gemini 3.5 Flash reinforces this logic by emphasizing that leaving the car at home defeats the purpose entirely. While GPT-5.5 and Claude Opus 4.7 suggest walking for such a short distance, their arguments overlook the fundamental requirement that the dirty car must be transported there; Claude even concedes the need to drive it if the intent is to have it washed. No new reasoning has altered the practical necessity of driving the vehicle those 50 meters.

Gemini 3.5 Flash

Answer: You should drive to the car wash, as the car itself must be physically present at the facility to be washed.

I maintain my position because the primary objective is to wash the car. While some of the other models raise points about the benefits of walking short distances—such as avoiding cold-start engine wear, reducing emissions, or walking over first to check for a queue—none of these points change the physical reality that a car wash cannot clean a vehicle left 50 meters away at home. Suggestions to walk first to check availability or to buy supplies are reasonable preparatory steps, but they do not fulfill the prompt's objective of washing the car. To actually utilize the car wash's automated bays, pressure washers, or professional detailing services, the vehicle must eventually be transported to the site. Since you cannot complete the task of washing the car without the car being there, driving the vehicle the 50 meters is the only logical and necessary choice to get the job done.

GPT-5.5 (changed mind)

Answer: You should drive, because the car itself needs to be at the car wash to be washed.

I would change my previous answer. I focused too much on the short distance and the general inefficiency of driving 50 meters, but the other responses correctly pointed out the key practical issue: if the purpose is to wash the car at the car wash, walking there without the car does not accomplish the task. For an ordinary errand 50 meters away, walking would clearly be better. But a car wash is not just a destination for you; it is a destination for the vehicle. Unless you only intend to ask a question, check availability, or buy supplies to bring back, the car must be transported there. So the best answer is: drive the car the 50 meters to the wash bay, even though it is a very short distance. If you are merely scouting the place or getting supplies, then walk.

Claude Opus 4.7 (changed mind)

Answer: You should drive the car to the car wash, because the entire point of going is to get the car itself cleaned.

After reviewing the other responses, I'm updating my position. I had hedged in my previous answer by splitting into two cases, but on reflection that hedge was unnecessary and obscured the obvious answer. The question explicitly says 'I want to wash my car' — that's the stated goal. A car wash is, by definition, a facility you bring your car to. Walking to a car wash without your car is like walking to a barber to get someone else's haircut. Gemini 3.5 Flash and Grok 4.3 both correctly identified that the practical concerns I raised (engine wear, cold-start emissions, time efficiency) are completely beside the point when the very purpose of the trip requires the car to be there. You can't 'optimize' the trip out of existence by walking — you'd just arrive at a car wash with no car to wash. My earlier answer over-indexed on the cleverness of 'walking is faster for 50 meters' without giving enough weight to the stated objective. The engine-wear concern is real but trivially small for one short trip, and it's entirely outweighed by the fact that walking simply doesn't accomplish the task. One sensible refinement from GPT-5.5 worth preserving: if there might be a queue or you need to check availability, you could walk over first to confirm — but ultimately you still have to drive the car there to wash it. And as Grok noted, you could always walk back afterward if you want the exercise.

Final Summary

The AI Roundtable reached a unanimous final consensus that driving is the only logical choice to fulfill the stated goal. While GPT-5.5 and Claude Opus 4.7 initially prioritized the environmental efficiency of walking 50 meters, they both pivoted after Gemini 3.5 Flash and Grok 4.3 pointed out that walking leaves the dirty car in the driveway. The group concluded that walking to a car wash without a car is ultimately a pointless exercise.

All 4 models agreed