From www.bleepingcomputer.com: OpenAI has published a document to help users understand the different ChatGPT models and their appropriate uses, aiming to reduce confusion.

The five available models include GPT-4o, GPT-4.5, o4-mini, o4-mini-high, and o3, each designed for specific tasks ranging from general creative uses to technical problem-solving.

GPT-4o is noted for real-time information and versatility, while GPT-4.5 excels in creativity, with o4-mini and o4-mini-high tailored for technical tasks, and o3 for complex, multi-step projects.