Fazlur Rahman
Published September 25, 2026 — San Francisco. OpenAI DevDay 2026 runs Tuesday, September 29 at Fort Mason in San Francisco. Sam Altman delivers the opening keynote at 10 a.m. Pacific, which will be livestreamed for free. The in-person developer event is sold out after applications closed on July 10, 2026.
Data last verified September 25, 2026 from openai.com/devday, devday.openai.com, The Verge, the OpenAI Developer Community, and Fortune reporting via tbreak.com.
At a glance
- DevDay 2026 is Tuesday, September 29 at Fort Mason Center in San Francisco.
- Sam Altman's opening keynote streams free at 10 a.m. Pacific.
- In-person attendance is full; $650 registration closed in late July 2026.
- Schedule runs from breakfast at 8 a.m. through a closing reception at 7 p.m. Pacific.
- Fortune reported on September 25 that OpenAI may preview GPT-6 Cyber at the event.
- OpenAI shipped GPT-6 Sol, GPT-6 Luna, and GPT-Live voices in the two weeks before the keynote.
Quick Answer
OpenAI DevDay 2026 happens on Tuesday, September 29, 2026 at Fort Mason Center in San Francisco, with Sam Altman delivering the opening keynote at 10 a.m. Pacific that streams free online. The in-person event sold out after applications closed on July 10, 2026; registered attendees paid $650 each.
How to watch the keynote for free
The opening keynote on September 29 streams live on the OpenAI event page at 10 a.m. Pacific. Sign up for a reminder on devday.openai.com; the recording posts to openai.com shortly after the event (openai.com, September 2026).
DevDay 2026 basics: date, venue, schedule, and how to watch
The full day runs from a 8 a.m. breakfast through a 7 p.m. closing reception, with the headline keynote at 10 a.m. and developer breakouts from late morning to mid-afternoon. Fort Mason is a waterfront conference venue on the north end of San Francisco, walking distance from Ghirardelli Square.
| Time (Pacific) | Session |
|---|---|
| 8:00 a.m. | Breakfast and check-in |
| 10:00 a.m. | Opening keynote with Sam Altman (livestreamed) |
| 11:15 a.m. - 3:30 p.m. | Breakouts and programming |
| 4:00 p.m. | Closing session |
| 4:45 p.m. - 7:00 p.m. | Networking reception |
Source: openai.com/devday official schedule, September 2026.
The keynote is the only livestreamed slot. Other sessions will be recorded and posted to openai.com in the days after the event, the same release pattern OpenAI used for DevDay 2025 (openai.com, September 2026).
What is likely on the agenda for developers
The agenda has not been published, but the model's release cadence over the past two weeks points to a developer-tooling heavy day. OpenAI shipped GPT-6 Sol and GPT-6 Luna on September 22 with API prices cut 50% from the GPT-5.6 line. On September 25 the company rolled out GPT-Live, a full-duplex voice model that brings agentic tools into ChatGPT Voice (OpenAI, September 2026).
| Release | Date (2026) | What it is |
|---|---|---|
| GPT-6 Sol and Luna | September 22 | Lower-cost GPT-6 family models, 50% API price cut vs GPT-5.6 |
| Claude Opus 5.5 | September 22 | Anthropic flagship, 40% lower operating cost than Opus 5 |
| GPT-Live voice models | September 25 | Full-duplex voice that runs tools and connected apps during a chat |
| OpenAI DevDay 2026 | September 29 | San Francisco developer keynote with Sam Altman |
Source: OpenAI release notes and benchmark aggregator benchlm.ai, September 2026.
Fortune reported on September 25 that OpenAI is preparing to preview GPT-6 Cyber, a security-focused model, alongside a separate product to deploy it more safely. OpenAI has not confirmed the model, pricing, or general availability (Fortune via tbreak.com, September 2026).
Expect App SDK updates that build on the "apps inside ChatGPT" launch from DevDay 2025. OpenAI tends to ship developer-tools one day and SDKs the next.
How to prepare: steps developers and enterprise teams should take now
Use the four working days between now and the keynote to clear a baseline, not to lock in choices. DevDay 2026 is a developer day, not a consumer product day, so production work should not move on announcements without benchmark verification.
- Capture current GPT-6 Sol and GPT-6 Luna benchmark runs as a baseline before any new release.
- Audit ChatGPT Voice integrations against the new GPT-Live rollout; the rollout may not hit every workspace on day one.
- Identify GPT-6 Cyber use cases if your team builds security tooling. The preview, if it ships, will not have public pricing yet.
- Treat any leaked tier or pricing (such as the rumoured $500 Pro Max) as unconfirmed until Sam Altman says it on stage.
The recording of the keynote and the breakout sessions will post to openai.com in the days after the event, so teams outside Pacific time do not need to block the morning to stay informed (openai.com, September 2026).
What DevDay 2025 launched, and how DevDay 2026 will likely differ
DevDay 2025 introduced "apps inside ChatGPT" and dev tooling that became the SDK focus of the year. DevDay 2026 lands with a different baseline: OpenAI's API tiers, voice products, and safety work all already changed in September 2026 ahead of the event.
DevDay 2024 shipped GPT-4o voice, real-time vision, and the Apps SDK. DevDay 2025 added agent primitives. DevDay 2026 is more likely to ship more limited previews, given the heavier regulatory backdrop in the U.S. and EU (OpenAI, 2025 and 2026).
If GPT-6 Cyber ships as preview, expect a security-eval ramp that mirrors the model spec release schedule for other previews: Day 1 model card and pricing, Day 7 first eval results, Day 30 GA decision (Fortune via tbreak.com, September 2026).
FAQ
Six short answers on OpenAI DevDay 2026.
What date is OpenAI DevDay 2026?
DevDay 2026 runs on Tuesday, September 29, 2026 in San Francisco at Fort Mason Center. The opening keynote at 10 a.m. Pacific is livestreamed for free (openai.com, September 2026).
Where is OpenAI DevDay 2026 held?
Fort Mason Center in San Francisco. In-person applications closed on July 10, 2026 and registration cost was $650 per attendee (OpenAI Developer Community, September 2026).
Can I watch the OpenAI DevDay 2026 keynote online?
Yes. The opening keynote is livestreamed free on September 29, 2026 at 10 a.m. Pacific. Other sessions will be recorded and posted to openai.com shortly after the event (openai.com, September 2026).
Is OpenAI DevDay 2026 in-person registration still open?
No. Applications closed July 10, 2026; acceptances were sent by late July. Accepted attendees had 14 days to register before their spot rolled to the waitlist (OpenAI Developer Community, September 2026).
What time is Sam Altman's DevDay 2026 keynote?
10 a.m. Pacific on Tuesday, September 29. The schedule lists breakfast at 8 a.m., breakouts from 11:15 a.m. to 3:30 p.m., the closing session at 4 p.m., and a reception from 4:45 to 7 p.m. (openai.com, September 2026).
What is GPT-6 Cyber, and will it be at DevDay 2026?
Fortune reported on September 25 that OpenAI may preview a cybersecurity-focused GPT-6 Cyber model at DevDay, alongside an unnamed product for secure deployments. OpenAI has not confirmed the model, capabilities, or pricing (Fortune via tbreak.com, September 2026).
How much did in-person DevDay 2026 cost?
Registration was $650 per attendee. Attendees were also responsible for their own travel and lodging to San Francisco (OpenAI Developer Community, September 2026).
Will DevDay 2026 announce a new ChatGPT tier?
OpenAI has not confirmed any new public ChatGPT tier. Reports from September 24 to 25 reference a possible $500 a month ChatGPT Pro Max tier leaked by TestingCatalog and Tibor Blaho; nothing is announced yet (Startup Fortune, September 2026).
Verify the latest OpenAI DevDay 2026 updates on devday.openai.com and openai.com before planning travel or production changes. This post is dated and may age within hours.
