References to an unannounced OpenAI assistant called “o” have surfaced in ChatGPT, suggesting the company is testing an always-on assistant that may have some form of email functionality.OpenAI has not announced the product, described its feature set, or confirmed a release date. With DevDay taking place Sept. 29 in San Francisco, the leak raises questions about whether “o” could become a new consumer-facing layer for tasks that continue after a user leaves ChatGPT.