OpenAI will hold its annual developer event, "OpenAI DevDay 2026," in San Francisco on September 29, US time. The keynote speech by CEO Sam Altman will be live-streamed for free starting at 10 AM US time (2 AM JST on September 30). OpenAI has announced it will unveil new APIs, tools, and technologies currently under development.

OpenAI DevDay roll call Where are you joining us from, and what are you building? pic.twitter.com/tRqB0JbPmS — OpenAI Developers (@OpenAIDevs) September 27, 2026

With the event just around the corner, information regarding several unannounced services has surfaced. Among them, an AI agent that continues to work in the background even when not actively operated by the user is drawing particular attention. Reports indicate that traces of an unannounced feature, internally referred to as "O," have been found within ChatGPT. There are also rumors that "Managed Agents," a system to collectively manage AI agent execution environments, skills, and plugins, is being prepared.

Furthermore, traces of a higher-tier plan for ChatGPT, seemingly priced at $500 per month and dubbed "Pro Max," have also been discovered. It is described as "Fastest Work and Codex," suggesting it could be a plan for professionals who want to use the new "O" agent and Codex at high speed. However, all of this information precedes an official announcement from OpenAI.

Fortune further reports that OpenAI plans to release "GPT-6 Cyber," a model for cybersecurity, within a few weeks. It is also said that a new product that entrusts AI with tasks like vulnerability discovery and patching is in preparation. However, it has not been confirmed whether this will be announced on DevDay itself.

This year, attention is also focused on OpenAI's first full-fledged hardware. On September 25, an OpenAI employee posted a mysterious device-like image on social media, leading to speculation that hardware might be unveiled at DevDay. However, the connection between the image and a new device has not been confirmed, and no strong theories supporting a hardware announcement at DevDay have emerged.

This DevDay may focus not on new GPT models, but on agent functions that allow AI to handle tasks for extended periods. Will OpenAI's first AI device also make an appearance? All eyes will be on the keynote speech starting at 2 AM JST on September 30.