GPT WTF?! – OpenAI Models Explained (PDF Guide)

As seen on the Nomaditsu Youtube channel:
https://youtube.com/@nomaditsu

Confused by GPT-4.1 coming after 4.5?
You're not alone.

This PDF is your no-nonsense field guide to the weird and wild world of OpenAI model names. Whether you're a creator, coder, or just curious, this visual reference traces the model lineage--from GPT-3.5 to the latest reasoning variants--so you can stop guessing and start creating with the right tools.

🔍 Inside this guide:

• A visual trip down memory lane of all model releases
• At a glance mental model for understanding the relationship between models
• Quick reference for when to use which model

This is the cheat sheet I wish I had when diving into OpenAI’s latest updates--and now it's yours.