Codex Full Course 2026: The NEW Best AI Coding Tool

GPT 5.5 is now out, and there's never been a better time to learn Codex. Which is better than Claude Code. The Codex Super-App (Full Beginners Guide) The All Purpose Interface for AI Agents Part 1: Codex Basics Install Codex, Projects, Chats, Documents, Plugins, Custom Skills, Automations Part 2: Multitasking with Codex iOS App Designs Build an iOS App Landing Page Launch Video Investor Deck Social Media Automation TIMESTAMPS: Part 1: Codex Basics 00:00 Intro 02:54 Part 1: Downloading Codex 03:20 Overview of Codex interface 03:56 Chats, Prompting, & Built in Search 04:53 Creating Projects 07:37 Creating Spreadsheet 09:43 How Files are stored and mentioned within projects 10:42 Quick Codex Overview 12:47 Search (CMD G) and Folder Organization 14:29 Skills and Plugins 16:29 Using Calendar Plugin 18:07 Creating Automations on Codex 19:18 Learn about Plugins (Figma) 21:37 Built in Image Gen 22:37 MCP Example (Paper for Design) 24:17 Opening Chats in mini-window 25:26 Steering vs Queueing the Agent 27:35 Creating Own Skill with API's 31:34 Using YouTube Researcher Skill (That we created) 33:24 Creating Automation with your custom skill Part 2: Multitasking (More chaotic and fun) 35:27 Part 2 Multitasking: Building iOS App, Web App, Investor Deck, Launch Video, Mobile Designs, and Automated X Posts 37:54 Creating Project 38:31 Planning my 6 Projects 40:25 Mobile Design Skill 41:47 Setting up iOS App 45:08 Implementing Desings into Mobile app 46:13 Creating a landing page that collects user info 46:45 Tally for form submission (Great for lead magnets) 49:43 Organizing and Renaming Chats for multitasking 52:12 Database for Mobile App (Supabase) 53:19 Generating app icons 54:08 Launch Video (Remotion) 59:32 Remotion Video Timeline and Seeing the Video Editor 01:05:37 Editing instructions for Remotion (Gridlines) 01:07:11 Editing Web App 01:09:46 Using CLAUDE CODE Inside Codex for Design (Terminal) 01:17:20 Forking a Chat to create investor deck 01:19:09 Using Claude 4.7 Opus for Designing Deck 01:20:22 Testing Canva Export (It's good) 01:22:33 Running Mobile App on Actual Phone (Not Simulator) 01:28:58 Finishing up All Projects (Mobile App, Landing Page Launch Video) 01:31:56 Exporting Deck and making changes in Canva 01:33:13 Deploy to Vercel using the Vercel Plugin 01:33:44 Adding Song to Remotion Video 01:35:26 Setting up x Post automations (Typefully) 01:37:57 Our App is on Testflight! 01:39:58 Final Remotion Video 01:41:04 Final Thoughts, Reflections, Summary More about me: rileybrown.xyz Sponsorships: https://rileybrown.xyz/sponsorships