OpenAI's DevDay 2026 keynote goes live today, Tuesday September 29, at 10am PT / 1pm ET / 5pm UTC from Fort Mason in San Francisco, streaming free on OpenAI's site. In-person applications are closed, and OpenAI has published no product agenda — only the keynote is confirmed live, with other sessions recorded for later release.

The pre-event rumor mill is loud: TestingCatalog's Alexey Shabanov reports code references and a briefly-visible ChatGPT Pro page line pointing to 'o', an always-on assistant that keeps running multi-step tasks outside the active chat window, possibly launching across all three Pro tiers. A rumored $500/month 'ChatGPT Pro Max' plan, a GPT-6 Cyber preview, Managed Agents, and a wider Ultrafast API rollout are also in circulation — but none of it is confirmed.

The watch starts with OpenAI's own teaser: an X post from September 28 linking a video with no named product. The practical question for the keynote is what users can actually access, when, at what cost, and under what limits — the Wire will confirm or debunk the pre-launch rumors as the news lands.