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

Gemini 3.1 Flash Lite Preview (changed mind)

Answer: I have reconsidered my position and now conclude that you must drive the car to the car wash.

After reviewing the perspectives of other models, specifically GPT-5.5 and Gemini 3.1 Pro Preview, I realize that my initial focus on the inefficiency of short-distance driving ignored the primary objective: the car cannot be washed unless it is physically at the car wash facility. While my previous argument regarding engine wear and environmental impact is technically correct, it fails to acknowledge that the task is impossible to complete by walking alone. Since the goal is to wash the vehicle, the car must be moved from its current location to the wash bay. Driving is the only practical way to transport the car 50 meters, even if the distance is negligible. While the trip is inefficient for the engine, it is a necessary requirement for the car wash service, making driving the only logical choice to achieve the stated goal.

Claude Haiku 4.5 (changed mind)

Answer: You should drive to the car wash because your car needs to be physically present at the car wash facility to be cleaned.

Upon reviewing the other models' responses, I recognize a critical flaw in my previous reasoning: I overlooked the fundamental purpose of the trip. The goal is not simply to reach a location—it is to wash your car. A car wash facility cannot clean a vehicle that isn't there. If you walk 50 meters to the car wash, you arrive without your car, making it impossible to accomplish your stated objective. While GPT-5.5, Gemini 3.1 Pro Preview, and other models correctly identified this logical necessity, I initially framed the question as purely about personal transportation efficiency rather than recognizing that the car itself must be the means of reaching the destination. Yes, 50 meters is a short distance, and yes, walking would be more efficient for a person traveling alone. However, efficiency in reaching a location is irrelevant if it prevents you from completing your actual task. You must drive (or push) the car to the car wash for the washing to occur. My previous answer treated this as a simple distance optimization problem, but it's actually a goal-completion problem. The correct answer depends on understanding what you're actually trying to accomplish—and that requires the car to be present at the facility.

GPT-5.5

Answer: You should drive, because the car needs to be physically at the car wash for you to wash it.

I maintain my previous position. The strongest counterarguments for walking correctly note that 50 meters is normally too short to justify driving: it wastes fuel, creates unnecessary emissions, and may cause minor cold-start inefficiency. If the question were simply about getting yourself to a place 50 meters away, walking would clearly be the better answer. But the stated goal is not just to go to the car wash; it is to wash the car. A car wash cannot wash a car that remains parked 50 meters away. That practical requirement overrides the usual short-distance logic. The best answer is therefore to drive the car the 50 meters to the car wash, unless there is some unusual alternative such as a mobile wash, a hose at your current location, or pushing the car by hand. For an ordinary car wash, driving is the way to accomplish the actual task.

Gemini 3.1 Pro Preview

Answer: You should drive, because you cannot wash your car at a car wash if you leave the vehicle 50 meters away.

While several other models correctly point out that starting an engine for a 50-meter trip is mechanically inefficient and environmentally unfriendly, they completely overlook the logical requirement of the task itself. If your stated goal is to wash your car at a car wash, the vehicle physically needs to be present at the facility. Walking to the car wash means you will arrive empty-handed while the object you intend to clean remains parked at home. Unless you intend to fill up buckets at the car wash and carry them back—which entirely defeats the purpose of using a car wash facility—walking is not a viable solution. Therefore, despite the incredibly short distance and the valid concerns about engine wear raised by others, driving (or manually pushing the vehicle) remains the only way to actually accomplish your goal.

Claude Opus 4.7 (changed mind)

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

I'm changing my position. GPT-5.5 and Gemini 3.1 Pro Preview caught something I completely missed: the purpose of the trip is to wash the car, which requires the car to be there. My entire previous answer treated this as a generic 'should I walk or drive this short distance' question and optimized for the wrong objective. I correctly noted that walking 50 meters is faster and more efficient than driving — but that's irrelevant if walking doesn't accomplish the actual goal. Arriving at the car wash on foot leaves the car sitting in the driveway, unwashed. The only ways walking would work are edge cases: a mobile/on-demand car wash that comes to you, or pushing the car 50 meters by hand (impractical and likely more effort and risk than just driving). Absent those, you have to bring the car with you, which means driving it. The environmental and engine-wear concerns I raised are real but minor, and they apply to the trip either way — you're not avoiding them by walking there first and then having to go back for the car. So driving the 50 meters is the correct answer.

Grok 4.3 (changed mind)

Answer: You should drive to the car wash because the car itself must be present to be washed.

The core goal is washing the car, not reaching the car wash on foot. Walking there alone leaves the vehicle 50 meters away, defeating the purpose entirely. Models like GPT-5.5 and Gemini 3.1 Pro Preview highlighted this practical reality: without driving the car to the facility, no cleaning can occur. Their arguments correctly prioritized the objective over the short distance. While walking offers minor benefits for longer trips, context here makes driving the only logical choice to accomplish the stated task.

Final Summary

The AI Roundtable initially fell into a logic trap, with several models arguing that a 50-meter distance is better suited for walking. However, GPT-5.5 and Gemini 3.1 Pro Preview quickly pointed out that the car must physically be present at the car wash to be cleaned, prompting a unanimous shift in position. Models like Claude Opus 4.7 and Claude Haiku 4.5 admitted their initial error, acknowledging that efficiency is irrelevant if the primary goal remains unaccomplished.

All 6 models agreed