Same prompt for all four: "Build Minecraft, but it’s a modern AAA title built for playing in the browser. Focus on performance, complete functionality, and at least a 5 minute vertical slice that is playable. Punch trees, make planks, build crafting table, make wooden pickaxe, mine stone."
Results: Claude was the best but took 1.5 hours, Grok fastest at 8m29s but also worst quality and functionality.
Full write-up and all 4 are playable in the link.
Any ideas on what to test next, or how to handle a controlled experiment with follow-up prompts?