OpenAI to announce "o" always-on agent during DevDay

OpenAI appears to be preparing an always-on agent that could launch as “O,” with DevDay on September 29 emerging as a possible announcement window. OpenAI has confirmed that DevDay takes place that day in San Francisco, with Sam Altman opening the keynote. We have spotted references to "O" across ChatGPT’s configuration, including “O” as a display name and an email suffix configured as “-o.” The agent was also recently referenced as a benefit on the upgrade page for the $100 Pro plan. Together, these clues point to a persistent agent designed to keep working outside a normal chat session, potentially with its own email identity from the start. The project may be related to “Aeon,” a name previously associated with OpenAI’s always-on agent work.