02 · Model Architectures
GPT
Generative Pre-trained Transformer
A specific family of LLMs (OpenAI's name). Generative (produces new text) · Pre-trained (learned general patterns before any task tuning) · Transformer (the architecture). Saying “GPT” describes all three at once.
Concrete example
“GPT-5” is one model in this family; “a GPT” loosely means any model built the same way.