What OpenAI might announce at DevDay, from an 'o' agent to a BUSY Bar integration
Sam Altman's September 29th keynote will most likely feature an always-on assistant, but OpenAI has confirmed no product announcements, it just keeps leaking stuff that implies it. We take a look at all the rumors and leaks for DevDay 20206.
By Ryan Merket · Published · Updated
Primary source: X · @OpenAI
Why it matters
OpenAI's teaser precedes a developer event where announcements can shape how builders use its models and tools. The post names no release, so the keynote remains the point at which any product claims can be assessed.
OpenAI has given developers a keynote time and a teaser, but no product agenda for DevDay. The clearest reported clue is an always-on assistant called "o"; new models, developer tools or a research system are also possibilities, with no confirmation that any are coming. RuntimeWire has covered the 'o' agent rumor separately; the evidence described below comes from TestingCatalog.
The post on X, published Monday, September 28th, links to a video but names no product or model. OpenAI's public schedule puts Sam Altman's keynote at 10 a.m. Pacific on Tuesday, September 29th.
https://x.com/openai/status/2104651136699609518?s=46
The leading rumor: an always-on assistant
The most specific report comes from TestingCatalog. On September 26th, it said ChatGPT configuration strings used "o" as a display name and included an "-o" email suffix. The outlet also reported that a ChatGPT Pro upgrade screen briefly listed "o, your always-on assistant."
That evidence points to a possible persistent agent, but it does not establish a release date or confirm a DevDay announcement. Claims about email access, scheduling and work continuing after a user leaves the chat remain speculation. OpenAI's Agents API, which entered public beta on September 10th, provides relevant context: developers can use it to run cloud agents, preserve context across long sessions, use tools and coordinate subagents. OpenAI says those agents can work for hours or days. The API is already available; the draft provides no indication that a new agent product will be announced alongside it. RuntimeWire has also reported on OpenAI's managed-agent plans ahead of DevDay, based on separate findings from TestingCatalog.
RuntimeWire also found hidden, disabled-by-default support for Flipper's BUSY Bar in OpenAI's desktop app, with graphics for displaying Codex task states. The September 3rd reporting points to work on agent interfaces beyond the app window; it concerns Codex and does not confirm anything about "o" or a DevDay announcement. RuntimeWire predicts the BUSY Bar will be the DevDay giveaway item.
Codex code points to more agent controls
A September 28th post by @DevAdventur3s on X says its review of Codex code found persistent agents and three interface concepts: teams working from a shared board, agents interacting mid-task and a command center. The poster claims 1,469 Codex pull requests were merged that month and predicts at least two features will ship. These are the poster's findings and forecast, not confirmed OpenAI announcements.
Teams working from a shared board
The post describes teams of agents working from a shared board. It offers no further details about how the board works or whether OpenAI plans to release it.
Mid-task agent interaction
The post also points to agents interacting while a task is underway. It does not specify what those interactions involve or confirm that the capability is coming to Codex.
A command center for agents
A command center is the third concept identified in the post. The source does not describe its interface or establish that OpenAI will announce one at DevDay.
Models and developer tools are possible, not confirmed
A new model is another possibility, though the teaser offers no evidence for one. OpenAI released GPT-6 Astra on September 3rd, followed by GPT-6 Sol and GPT-6 Luna on September 22nd for ChatGPT Work, Codex and the API. RuntimeWire's coverage of the latter launch described them as lower-cost models for professional work and coding.
Anthropic released Claude Sonnet 5.5 on September 28th, giving OpenAI a fresh competitive reason to update a model at DevDay on September 29th. The timing makes an OpenAI model update plausible, though it provides no evidence that one is planned.
Developer products could also fit the event's stated focus on APIs, tools, demos and workshops. Last year's DevDay gives a sense of the range, not a forecast: on October 6th, 2025, OpenAI introduced Apps in ChatGPT and the Apps SDK, AgentKit, Sora 2 in the API, Codex updates and new API models. Its 2025 event page framed the releases around building agents, coding and distributing apps through ChatGPT. In December, OpenAI began accepting app submissions for review and publication, giving developers a route to the ChatGPT app directory after the Apps SDK preview. None of that confirms a repeat of those announcements this year.
A research system is another open question
OpenAI's September research update said the company had met its goal of building an automated "research intern" by September 2026. The system can complete well-defined research tasks under human direction, including work that might take a skilled researcher a few days. RuntimeWire has covered the research-intern milestone; OpenAI's research update also described coding agents becoming routine in researchers' work. Neither report says the system will be shown or released at DevDay.
Altman wrote on September 15th that a "big ship" was coming that week, "and then for devday," adding six ship emojis. He gave no product name or launch details. The post, as reported by The Express, adds to the speculation without laying out a product roadmap. On September 26th, OpenAI's developer account posted: "72 hours to OpenAI DevDay. We've been building. Time to show our work," according to the TestingCatalog report.
What the schedule confirms
OpenAI describes the San Francisco event at Fort Mason as a day of technical sessions on APIs and tools, hands-on demos and workshops. Its event page lists Altman's keynote at 10 a.m., with breakouts and programming from 11:15 a.m. to 3:30 p.m., plus a free livestream. In-person applications are closed; invited attendees pay $650 to register, according to the event FAQ. Later DevDay Exchanges are planned for Bengaluru, Tokyo, Seoul, Berlin, Paris, London, Sao Paulo and Mexico City.
The schedule establishes a developer-focused event, not a release slate. For now, "o" is the clearest reported product clue. The Agents API, recent GPT-6 releases and research-intern milestone are confirmed context; the rumored assistant's features and any DevDay launch remain unconfirmed. Altman's keynote is scheduled for September 29th at 10 a.m. Pacific.