GPT-5 Fast vs Thinking vs Pro: How They Actually Work
OpenAI recently released the GPT-5 family, introducing three distinct options for Pro users: GPT-5 Fast, GPT-5 Thinking, and GPT-5 Pro. While it’s common knowledge that GPT-5 Fast handles simple tasks and GPT-5 Pro tackles complex ones, the underlying mechanisms remain unclear to many users. This post provides a concise explanation of how each variant operates and when to use them effectively. GPT-5 Fast For the context of this article, we will use GPT-5 Fast as our base model, think of it as a black box optimized for speed, good old LLM. When you submit a query, it processes the request and delivers an answer quickly without extensive deliberation. ...