I gave Opus 5.5 one prompt and six hours to visualize Invisible Cities

The author tested Claude Opus 5.5 and GPT-6 Astra on creating an interactive 3D visualization of Italo Calvino's "Invisible Cities," finding that both models successfully generated working prototypes within hours and modest API costs. While GPT-6 Astra completed the task in 53 minutes with some unnecessary design elements, the author notes that Opus 5.5 represents a significant leap in AI-assisted design capabilities, particularly for complex interactive visualizations that previously required substantial manual refinement.