Grok 4.6 crashed user browsers rendering a lava lamp. We ran it through BridgeBench's UI Bench. It wrote code that caused an infinite loop just to display a lava lamp on screen. Browsers froze. Users had to force quit. GPT 6 Astra did it in 5 minutes for $0.63. No crashes. Actually looks like a lava lamp. Grok 4.7 needs to be significantly better at frontend work.