1. Cost and token economics
Commenters repeatedly noted the token price of the demo and wondered about the real cost of running the model.
- “One useful hint here is the API token cost - in this case about $74 in API tokens for Opus 5.5.” — simonw
- “I wonder how you only reach $74 in 6 hour runtime. I would have guessed this runtime goes into the hundreds of dollars.” — chrisandchris
- “Approximately nothing - the carbon cost of electricity is already very low, and most of the inference costs are GPU and datacenter amortization.” — stratos123
2. AI‑generated quality vs. “slop”
Many felt the output showed impressive details but suffered from typical AI artefacts (nonsensical geometry, lack of intent).
- “while many of the scenes have obvious markers of slop (impossible intersecting geometry, bridges to nowhere, and so on), the scenes largely do work to convey the intended concept/emotion…” — swiftcoder
- “These visualizations are as terrible as they are unnecessary.” — mcphage
- “With AI generated stuff, sure it looks amazing at first glance but I definitely don’t want to zoom in, since I know it’s all a cardboard facade with no passion.” — sailingparrot
3. Impact on human imagination and the book’s intent
Several warned that visualising the “invisible cities” spoils the personal, imaginative experience Calvino intended.
- “If you haven’t read the book yet, I’m tempted to warn you against opening the visualization. Part of the joy of reading this book is letting your mind’s eye run wild…” — droidjj
- “How Opus 5.5 imagines these cities is a question for Opus. The real experience is how we imagine - and I believe there are no two people who have exactly the same mental image of an invisible city.” — stared
- “As neat as this project is, this does no justice to whatsoever to the book… this book is about semiotics, meaning, language, and it’s limits.” — uludag
4. Environmental concerns (CO₂ emissions)
A recurring thread questioned the carbon footprint of running LLMs for fun demos.
- “I wonder how much co2 is being thrown into the atmosphere everyday through the steady stream of “look what I made this LLM do” and endless “benchmarking”?” — adrithmetiqa
- “I wonder how much co2 you use to get through the day, and how much you use to remark on other people's creations…” — r2_pilot
- “What a terrible thing to say to human! Being (presumably) human, it is their inalienable, natural-born right to do so.” — gspr (replying to the CO₂ comment)
- “This has given me a great idea: I have a modest proposal on how to reduce net CO2 emissions while not reducing token consumption at all.” — duskdozer