Compare Opus and Sonnet rebuilding the same 3D scene in three.js
A designer gave Opus 5.5 and Sonnet 5.5 the same prompt and 20 frames of the Claude Code mascot and asked each to rebuild it in three.js, one try each with no fixes.
Source
@yurshevv on X · 2026-10-14
Written in our own words. Credit to the original author. Link checked 2026-10-21.
What they did
A designer gave Opus 5.5 and Sonnet 5.5 the same prompt and 20 frames of the Claude Code mascot and asked each to rebuild it in three.js, one try each with no fixes.
Result (as claimed)
Opus took 27 minutes and put a tiny world with water, snow and lava in every keycap; Sonnet took 15 minutes and made a simpler character. He rated Opus higher.
Tools they used
Cost: Claude Opus 5.5: from $4 in / $20 out per 1M tokens; Claude Sonnet 5.5: from $2 in / $10 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 Opus 5.5 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: Compare Opus and Sonnet rebuilding the same 3D scene in three.js What the original author did: A designer gave Opus 5.5 and Sonnet 5.5 the same prompt and 20 frames of the Claude Code mascot and asked each to rebuild it in three.js, one try each with no fixes. Reported result (as claimed by the author): Opus took 27 minutes and put a tiny world with water, snow and lava in every keycap; Sonnet took 15 minutes and made a simpler character. He rated Opus higher. Source: https://x.com/yurshevv/status/2110478089478127834 Tools they used: Claude Opus 5.5, Claude Sonnet 5.5, three.js 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: Compare Opus and Sonnet rebuilding the same 3D scene in three.js What the original author did: A designer gave Opus 5.5 and Sonnet 5.5 the same prompt and 20 frames of the Claude Code mascot and asked each to rebuild it in three.js, one try each with no fixes. Reported result (as claimed by the author): Opus took 27 minutes and put a tiny world with water, snow and lava in every keycap; Sonnet took 15 minutes and made a simpler character. He rated Opus higher. Source: https://x.com/yurshevv/status/2110478089478127834 Tools they used: Claude Opus 5.5, Claude Sonnet 5.5, three.js 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: Compare Opus and Sonnet rebuilding the same 3D scene in three.js What the original author did: A designer gave Opus 5.5 and Sonnet 5.5 the same prompt and 20 frames of the Claude Code mascot and asked each to rebuild it in three.js, one try each with no fixes. Reported result (as claimed by the author): Opus took 27 minutes and put a tiny world with water, snow and lava in every keycap; Sonnet took 15 minutes and made a simpler character. He rated Opus higher. Source: https://x.com/yurshevv/status/2110478089478127834 Tools they used: Claude Opus 5.5, Claude Sonnet 5.5, three.js 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 compare AI models on the same prompt · How to make 3D scenes and models with AI and Blender · How to vibe code an app with Claude Code
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