A developer compared Claude Opus 5.5 and GPT-6 Astra on creating interactive three.js visualizations of Italo Calvino's Invisible Cities, finding Opus 5.5 produced superior design quality despite completing the task in 1.5 hours rather than the requested 6 hours. The experiment highlights how modern LLMs excel at AI-assisted design and interactive visualization tasks, raising questions about the future role of human designers.