How to master ChatGPT
Seven specialist models, agentic power-ups, and a one-weekend training sprint
The public release of ChatGPT in late 2022 felt like a Big Bang, by mid-2025 we’re living in the sprawling galaxy it formed. Monthly active users have cleared 180 million, and the model roster has ballooned from one vanilla GPT-3.5 to a buffet of specialist brains - GPT-4o, GPT-4.5, o3, and whatever codenamed surprise is gestating in the lab.
Keeping pac…