I Made Claude Code and Codex Build the Same App (RAW RESULTS)
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I gave Claude Code (Opus 4.6) and Codex (GPT 5.3) the exact same prompt: build a full-stack competitive intelligence app from scratch using Supabase, Firecrawl, and Vercel - then deploy it live. Then I had Gemini Pro 3 judge both codebases to decide who actually won.
The results? Not even close.
Grab all the files here:
https://drive.google.com/drive/folder...
What to watch next:
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Timestamps:
0:17 — The Challenge Setup
0:36 — The Prompt & Rules
1:27 — What We're Building (Rival App)
2:53 — Both AIs Start Planning
5:46 — Codex's Plan Review
6:31 — Atlas Framework Explained
8:39 — Claude's Plan Review
11:09 — GOTCHA Framework Overview (Quick)
13:35 — Atlas Build Framework Explained
15:07 — How to Set This Up Yourself
16:04 — Build Progress Check-In
17:10 — Claude Finishes First
18:28 — Codex Still Struggling
20:00 — Both Apps Deployed — Let's Test
22:26 — Side-by-Side UI Reveal
23:02 — First Functionality Test
24:24 — Gemini Judges the Backend
26:18 — Claude vs Codex: UX & Speed
37:12 — The Verdict
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[ABOUT ME]
If you're new here — I'm Mansel.
In 2010, I left South Africa with nothing but a laptop and a digital piano.
I taught myself IT, broke into cybersecurity in London, and built two consulting businesses - one in cyber, one in cloud - scaling solo to $52K+/month.
Today, I run atomicOps, an AI consultancy based in New York where we help mid-market companies turn AI chaos into scalable systems as a transformation partner.
I also help aspiring AI builders think like an architect, design agentic AI solutions, and sell them to businesses in my skool community.