DevDay is tomorrow, and the 'o' leak has hardened from speculation into something close to a pre-launch. On September 26, a user spotted the phrase "o, your always-on assistant" on the ChatGPT Pro upgrade page. It was pulled within hours, but code references remain: "o" as a display name and "-o" as an email suffix.

TestingCatalog's Alexey Shabanov, citing an inside source, reports 'o' will be the star of DevDay 2026 — a persistent AI agent that keeps running after a chat session ends, designed for multi-step tasks like coding, planning, and research outside the active chat window. The leaked Pro-page listing suggests it will be available across all three ChatGPT Pro tiers, with a fast mode for subscribers.

Shabanov ties 'o' to an earlier internal project codenamed Aeon, used for custom agents in ChatGPT Workspace for enterprise — 'o' would be the consumer-facing version. Tibo Sottiaux dropped a hint of his own: "o yes… we're back, and we're resetting usage limits for all paying users on Codex and ChatGPT Work." Bloomberg previously reported OpenAI exploring a donut-shaped hardware device, and the suspended @o handle on X looks reserved ahead of launch. DevDay eve roundups expect 'o' alongside GPT-6 Cyber and Managed Agents — 12+ product announcements tomorrow.

Resolved September 29: confirmed in substance. The always-on agent shipped at DevDay as 'dots,' powered by GPT-6 Astra with its own cloud computer and browser, rolling out to Pro and Business Premium users. The rumored names were wrong — it isn't called 'o,' and there was no sign of the 'Aeon' variant codename.

Update (2026-10-08): DevDay 2026 (Oct 6) confirmed the always-on personal agent — but it launched as "Dots," powered by GPT-6 Astra with its own cloud computer, not "o" / "Aeon." Dots roll out to Pro, Business Premium and Enterprise users; the EEA, UK and Switzerland are excluded at launch.