OpenAI
DevDay 2026
Schedule, updates and confirmed facts
Follow the keynote, check each source, and track what is still unknown about o, Codex and Agents API.
Opening keynote · Sam Altman
Until the opening keynote
What we know so far
The event date, venue and Sam Altman's keynote are confirmed. The keynote's product announcements have not been disclosed in the official event information reviewed here.
The o assistant is a reported leak. Durable sessions, hosted sandboxes and subagents are already documented API capabilities.
Check the evidenceLatest updates
Newest first. Each record includes its evidence and status.
6 updates
Durable sessions, subagents and hosted sandboxes are documented
These Agents API capabilities already appear in OpenAI's documentation. This entry records a documentation review, not a DevDay launch or an API release date.
Schedule checked: keynote at 10 a.m. Pacific
Sam Altman is listed for the opening keynote. OpenAI links to a livestream reminder on its event page. This is our schedule check, not a new announcement today.
A DevDay launch for “o” remains unconfirmed
The proximity of the report to the event is a reason to watch, not evidence of a scheduled release.
Report finds references to an assistant named “o”
TestingCatalog reports an upgrade-screen reference and configuration entries for a display name and “-o” email suffix. The report does not establish a launch date or working email feature.
GPT-6 Sol and Luna were released before DevDay
OpenAI's announcement covers GPT-6 Sol and Luna in ChatGPT Work, Codex and the API. These are existing releases, not predictions for the keynote.
What is confirmed?
A product name in code is not a release announcement.
An official page or documentation supports the claim.
Reported UI or code references; no official release announcement.
A public hint without a named product announcement.
An inference that still needs evidence.
Durable sessions & subagents
ConfirmedExisting API documentation, not a DevDay reveal.
“o” product references
Reported leakReported UI and configuration references.
DevDay product changes
TeaserTibo's post, available via a public mirror.
“o” launching at DevDay
SpeculationNo official launch date in the sources reviewed.
Reported name. Unannounced product.
What do the “o” reports actually show?
TestingCatalog reports references to an always-on assistant in ChatGPT. Its features, permissions and release remain unconfirmed.
Reported evidence
- An assistant name in upgrade UI
- Display-name configuration
- An “-o” email suffix
Still unknown
- Release date and access
- Email, memory and scheduling
- Relationship with Codex and API
The API capabilities already documented
Explore each capability. These diagrams explain the API, not the internal architecture of o.
Keep the same session
Configuration, conversation and saved work stay with a session. New input can resume an idle session or steer work in progress.
A durable session does not mean a process runs forever.
15 questions still to answer
A watchlist for the keynote, not a list of promised features.
Product & availability
- 01Will OpenAI announce a product called o?
- 02Will it launch at DevDay or later?
- 03What will “always-on” mean in practice?
- 04Which plans and regions will have access?
- 05Will developers get an API for the product?
Tasks & integrations
- 06Can it continue after the user leaves?
- 07Can external events start tasks?
- 08Will scheduled tasks be supported?
- 09Which email, calendar and code services can it use?
- 10Will it have its own email address?
Execution & control
- 11Can it hand work to Codex?
- 12Can it delegate to subagents?
- 13Does it have a persistent computer?
- 14How can users inspect or clear its memory?
- 15Which actions need approval, and how can work be stopped?
Frequently asked questions
When is OpenAI DevDay 2026?
September 29 at Fort Mason, San Francisco. The keynote starts at 10:00 a.m. PDT: September 30 at 01:00 in Beijing, Taipei and Hong Kong.
Where can I watch the keynote?
OpenAI says the keynote will be streamed free. Its event page currently offers livestream reminders; use the official event link above.
What is “o”? Is a launch confirmed?
A reported assistant name found in ChatGPT UI and configuration. The sources reviewed do not confirm its release, features or availability.
Does OpenAI already support multiple agents?
Yes. The Agents API documents independent subagents coordinated by a main agent. That existing capability does not confirm the architecture of o.
Can an agent resume earlier work?
The Agents API documents reusable sessions that preserve configuration, conversation and saved work. An application can send further input to the same session.