OPENAI'S OWN TEAM CALLED THIS THE BEST CODEX TUTORIAL ON THE INTERNET RIGHT NOW. Not a clickbait claim. The people who built the tool said it themselves. Just dropped a 2-hour masterclass on Codex plus GPT-5.5 and it is the most comprehensive thing available on this stack anywhere. Here is what you learn in under 2 hours: Skill and plugin setup from scratch so you are not fumbling through documentation for 3 days trying to figure out what connects to what. Automated workflow building that takes you from manually prompting to systems that execute on their own. Multi-threading practical demos showing you how to run parallel tasks simultaneously instead of waiting for one thing to finish before starting the next. The best practices for vibe coding that separate people shipping real products from people building demos that never get deployed. Codex plus GPT-5.5 is the strongest combo available in the market right now. Codex handles the agentic execution layer. GPT-5.5 handles the reasoning layer. Together they do things that neither one does alone. Most people are still learning these tools separately. The people watching this tutorial this weekend will understand how to combine them before the majority of developers even know the combination exists. Two hours. Free. Endorsed by OpenAI's own team. Bookmark this before you open your IDE today. Follow @cyrilXBT for every tutorial worth your time the moment it drops.(CyrilXBT)