OpenAI folded an agent into ChatGPT that chooses its own tools as it works. ChatGPT agent merged three things that had been separate — Operator's ability to work websites, deep research's synthesis, and ChatGPT's conversation — into one system. Working on its own virtual machine, it moves between a browser, a terminal and code execution to go from checking a calendar through gathering material to producing editable slides and spreadsheets, pausing to ask the user to log in where a site requires it. It went to Pro subscribers first, with Plus and Team following.