ChatGPT 5.5 Codex is the great AI coding tool ever. Here's how to use it

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The prompt:
I want to build out a full stock investing app. This is an app where I can enter a company or ticker, then see their charts, get the latest news, do research, and save companies to my portfolio. First I want to design the user interface. Can you generate 5 options for clean, simple, but really visually powerful interfaces using the image gen model

Timestamps:
0:00 Intro
0:55 The interface
3:08 The prompt
6:55 Building a marketing video
9:32 Computer use
11:27 V1 of the app
12:17 In app browser
14:03 Reverse prompting
17:09 The final marketing video
19:03 Automations

YouTube

A walkthrough of building a full-stack stock investment tracking app using ChatGPT Codex, OpenAI's desktop AI coding tool. Covers key features including integrated image generation for UI design, multi-agent multitasking (running separate developer, marketing, and research agents simultaneously), built-in browser for live testing and annotation, automated code quality checks via GitHub integration, and using Convex as a backend database. The author argues Codex outperforms Claude Code due to higher usage limits, GPT-4.5's intelligence, and unique built-in features like Remotion for marketing video generation and computer use for web research.

ChatGPT 5.5 Codex is the greatest AI coding tool ever. Here's how to use it