Happy 3 years, ChatGPT: Here is a complete version-by-version journey from GPT-3.5 to GPT-5.1

Since its debut in November 2022, ChatGPT has evolved rapidly through multiple versions: GPT-3.5, GPT-4, GPT-4o, GPT-4.5, GPT-4.1, GPT-5 and now GPT-5.1, each introducing major improvements in ...