Build a rainy neon city in 52 KB of WebGPU with a critic agent grading each render
A builder had Claude Code with Opus 5.5 make a rainy neon city as one 52 KB HTML file with no engine or libraries. Claude screenshotted its own render and a fresh critic agent roasted it three times before it was done.
Source
@gogetit1214 on X · 2026-10-19
Written in our own words. Credit to the original author. Link checked 2026-10-19.
What they did
A builder had Claude Code with Opus 5.5 make a rainy neon city as one 52 KB HTML file with no engine or libraries. Claude screenshotted its own render and a fresh critic agent roasted it three times before it was done.
Result (as claimed)
Finished in 40 minutes.
Tools they used
Cost: Claude Code: from $17/mo; Claude Opus 5.5: from $4 in / $20 out per 1M tokens.
Set it up
Write a one-page brief
Describe the app in plain words: who it is for, the 3 core screens or actions, and what "done" looks like.
Start the project with your agent
Open Claude Code and paste the brief. Ask it to propose a stack and a file plan before writing code.
Build one slice at a time
Ship the smallest working flow first, run it, then add features one by one. Commit after each working step.
Test it like a user
Click through on desktop and phone. Ask the agent to add basic tests and fix anything that breaks.
Check security and ship
Keep keys in environment variables, check auth and database rules, then deploy and share the link.
Copy the full setup prompt
Paste into your agent and it will walk you through the setup, asking before anything that sends, posts or spends.
You are helping me set up this AI use case end to end in Claude Code. Goal: Build a rainy neon city in 52 KB of WebGPU with a critic agent grading each render What the original author did: A builder had Claude Code with Opus 5.5 make a rainy neon city as one 52 KB HTML file with no engine or libraries. Claude screenshotted its own render and a fresh critic agent roasted it three times before it was done. Reported result (as claimed by the author): Finished in 40 minutes. Source: https://x.com/gogetit1214/status/2112109952030670933 Tools they used: Claude Code, Claude Opus 5.5, WebGPU Category: Vibe coding & apps Please: 1. Ask me 3 short questions about my situation (accounts I have, budget, what I want the output to look like). 2. Propose a step-by-step plan using these tools or cheaper alternatives, with the time and cost of each step. Use official pricing pages; say "check pricing" if unsure. 3. Then do the setup with me one step at a time, waiting for my OK before anything that sends messages, posts publicly, spends money or deletes data. 4. Finish with a checklist to run it again next time.
You are helping me set up this AI use case end to end in Codex. Goal: Build a rainy neon city in 52 KB of WebGPU with a critic agent grading each render What the original author did: A builder had Claude Code with Opus 5.5 make a rainy neon city as one 52 KB HTML file with no engine or libraries. Claude screenshotted its own render and a fresh critic agent roasted it three times before it was done. Reported result (as claimed by the author): Finished in 40 minutes. Source: https://x.com/gogetit1214/status/2112109952030670933 Tools they used: Claude Code, Claude Opus 5.5, WebGPU Category: Vibe coding & apps Please: 1. Ask me 3 short questions about my situation (accounts I have, budget, what I want the output to look like). 2. Propose a step-by-step plan using these tools or cheaper alternatives, with the time and cost of each step. Use official pricing pages; say "check pricing" if unsure. 3. Then do the setup with me one step at a time, waiting for my OK before anything that sends messages, posts publicly, spends money or deletes data. 4. Finish with a checklist to run it again next time.
You are helping me set up this AI use case end to end in Grok Bot. Goal: Build a rainy neon city in 52 KB of WebGPU with a critic agent grading each render What the original author did: A builder had Claude Code with Opus 5.5 make a rainy neon city as one 52 KB HTML file with no engine or libraries. Claude screenshotted its own render and a fresh critic agent roasted it three times before it was done. Reported result (as claimed by the author): Finished in 40 minutes. Source: https://x.com/gogetit1214/status/2112109952030670933 Tools they used: Claude Code, Claude Opus 5.5, WebGPU Category: Vibe coding & apps Please: 1. Ask me 3 short questions about my situation (accounts I have, budget, what I want the output to look like). 2. Propose a step-by-step plan using these tools or cheaper alternatives, with the time and cost of each step. Use official pricing pages; say "check pricing" if unsure. 3. Then do the setup with me one step at a time, waiting for my OK before anything that sends messages, posts publicly, spends money or deletes data. 4. Finish with a checklist to run it again next time.
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Guides for this use case
How to automate work with n8n and AI · How to vibe code an app with Claude Code · How to build a website with AI agents
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