OpenAI DevDay is today: when and how to watch

OpenAI DevDay takes place tomorrow, Tuesday, September 29, 2026, at Fort Mason in San Francisco. Sam Altman's opening keynote starts at 10 a.m. PDT / 1 p.m. EDT / 5 p.m. UTC, with a free livestream for viewers outside the venue.

When and how to watch

Head to OpenAI's official livestream page for the keynote. The DevDay event site also offers a reminder signup. In-person applications are closed, but the keynote stream is free and open to everyone.

OpenAI says other sessions will be recorded and posted afterward. It has not promised a livestream of the entire day's program.

We saved you a seat. See you tomorrow for the OpenAI DevDay keynote:

— OpenAI Developers (@OpenAIDevs), September 28, 2026

What OpenAI has confirmed

The official program promises technical sessions on APIs and tools, hands-on demos and workshops, and time with the teams building OpenAI's products. That makes developer workflows the clearest confirmed theme. The public schedule does not name the products or models that will be announced.

The distinction matters when reading the pre-event chatter: an official invitation confirms the event, but it does not verify a leaked product name, a subscription price, or a launch date.

The rumors to watch: an always-on assistant and a higher-priced plan

An assistant called “o.” In a September 26 report, TestingCatalog said it found references to “o” in ChatGPT configuration, an “-o” email suffix, and a brief mention on an upgrade screen. The outlet interprets those clues as evidence of an always-on assistant that could keep working beyond a normal chat session.

That is reported evidence of a possible product, not an OpenAI launch announcement. The name, release timing, supported tasks, and access remain unconfirmed. An email-related string alone does not establish what an agent can send or do on a user's behalf.

An upcoming always-on assistant from OpenAI will be named “o”.

— TestingCatalog (@testingcatalog), September 26, 2026. This is the outlet's claim, not official confirmation.

A possible $500 Pro Max subscription. TestingCatalog separately reported on September 24 that unreleased subscription references pointed to a $500-per-month ChatGPT Pro Max plan emphasizing faster Work and Codex access. Its report includes Tibor Blaho's observation of a higher-tier Pro plan. The proposed price, final benefits, and a DevDay unveiling remain unconfirmed.

What would make the announcements useful

Our watchlist is practical: what people can actually access, when they can use it, what it costs, and what limits apply. If OpenAI introduces a persistent assistant, we'll look for an explanation of permissions, oversight, and how users stop or inspect its work. If a new paid tier appears, we'll look for concrete differences in access and usage rather than a speed label alone.

These are questions for the keynote, not predictions about its contents. Follow our live DevDay coverage for the confirmed details as they emerge.