OpenAI headquarters is in San Francisco. The address that appears in OpenAI’s own legal and privacy pages is 1455 Third Street, San Francisco, California 94158.[1][2] In practice, though, the company’s headquarters now works more like a Mission Bay campus than a single front door. Public reporting shows OpenAI expanded from two large Third Street buildings into additional nearby space on Terry Francois Boulevard and Owens Street, pushing its San Francisco footprint past 1 million square feet by March 2026.[6][7][8] This guide explains the confirmed location, what is known about the office layout and amenities, and what visitors should realistically expect if they want an office tour.
Where OpenAI headquarters is
The clearest answer is this: OpenAI’s headquarters is in Mission Bay, San Francisco, and the company’s own official pages list 1455 Third Street, San Francisco, CA 94158 as its registered office address.[1][2] If you only need the headline fact for a citation, mailing reference, or company profile, that is the address to use.
That said, the phrase “OpenAI headquarters” can be a little misleading in 2026. OpenAI no longer looks like a startup with one compact office. Public reporting and real estate coverage describe a growing Mission Bay footprint that includes multiple nearby buildings, with 1455 Third Street acting as the anchor address most often attached to the company.[6][7][8]
This is one reason you still see conflicting answers online. Some older listings and directories repeat OpenAI’s earlier Mission District address, while newer official materials point to 1455 Third Street.[1][2] For a current reader, the safest rule is simple: use 1455 Third Street for the official headquarters address, and think of the broader headquarters operation as a Mission Bay campus.
If you want the company context behind that growth, start with OpenAI History, then read openai’s cto and leadership team and Sam Altman Biography. Those guides make the scale of the headquarters expansion easier to understand.
What the Mission Bay headquarters actually includes
OpenAI’s San Francisco headquarters now appears to be a cluster of large Mission Bay offices rather than one isolated building. The first major jump came in 2023, when Uber confirmed that OpenAI took 486,600 square feet across two buildings at 1455 and 1515 Third Street.[6] In 2024, OpenAI added a major lease at 550 Terry A. Francois Boulevard, reported as 350,000 square feet by the San Francisco Standard.[7] Then in March 2026, the San Francisco Chronicle reported that OpenAI had finalized a roughly 280,000-square-foot sublease at 1800 Owens Street, pushing its citywide footprint to more than 1 million square feet.[8]
| Mission Bay site | What public sources say | Confirmed scale |
|---|---|---|
| 1455 Third Street | Official registered office address on OpenAI’s own legal and privacy pages.[1][2] | Anchor headquarters address |
| 1455 and 1515 Third Street | Uber said it leased these Mission Bay offices to OpenAI in 2023.[6] | 486,600 square feet.[6] |
| 550 Terry A. Francois Blvd. | OpenAI finalized another large Mission Bay lease in 2024.[7] | 350,000 square feet reported.[7] |
| 1800 Owens Street | OpenAI completed a third Mission Bay expansion by February 2026.[8] | Roughly 280,000 square feet reported.[8] |
The practical takeaway is that “OpenAI headquarters” now refers to a San Francisco operating base with several nearby offices. That matters if you are trying to understand recruiting, security, or company scale. A frontier AI lab with research, product, safety, policy, and go-to-market teams does not fit neatly into a single startup floor anymore.
It also helps explain why San Francisco keeps showing up in coverage of OpenAI’s growth, hiring, and valuation. The company’s physical footprint has expanded alongside its public profile. For the business side of that story, see our take on openai valuation, openai and microsoft, and this guide to openai headquarters if your interest is mainly about hiring demand.
A realistic office tour, based on public information
OpenAI does not publish a public walkthrough of its headquarters, and it does not advertise a public visitor tour on the pages reviewed for this article.[1][2][3] So the only responsible way to offer an “office tour” is to stick to details the company itself has made public in job postings and office descriptions.
Those listings describe San Francisco offices with an open-plan layout, height-adjustable desks, conference rooms, phone booths, stocked kitchens, three in-house prepared meals each day, private outdoor space, nap rooms, and bike storage.[4] They also describe a hybrid schedule of three days per week in the office, with optional work from home on Thursdays and Fridays for that role.[4]
From that, you can infer a lot about the headquarters environment. It is probably designed less like a glossy public showroom and more like a high-output engineering workplace: dense collaboration areas, many private call spaces, food on site, and enough amenities to keep long technical workdays efficient. That setup is common in upper-tier Bay Area product and research companies, but OpenAI’s own job pages confirm those features directly here rather than leaving them to rumor.[4]
If you picture the office, think of four zones. First, open work areas for engineers, researchers, and product staff. Second, enclosed rooms for meetings, demos, and candidate interviews. Third, support spaces such as kitchens, booths, and bike storage. Fourth, decompression spaces such as nap rooms and outdoor seating.[4] That is a more realistic mental model than the dramatic “secret lab” imagery that often surrounds OpenAI online.
Readers interested in working there should pair this section with OpenAI Careers and OpenAI Jobs. If your focus is product rather than workplace culture, OpenAI News is the better running update page.
Can you visit OpenAI headquarters?
For most readers, the honest answer is no. OpenAI’s public site does not present its headquarters as a tourist stop, museum, or drop-in visitor center on the official pages used here.[1][2][3] That means you should not expect a lobby exhibit, scheduled public tours, or a general admission office visit.
If you are a job candidate, business partner, vendor, or event attendee, you may visit by invitation. That is normal for a private company, and especially normal for one working on frontier models, high-value infrastructure, and sensitive product launches. Even without a public security policy page about tours, the combination of hybrid office use, hiring activity, and the nature of OpenAI’s work strongly suggests access is controlled rather than open-ended.[3][4]
If your goal is simply to see the neighborhood, Mission Bay is easy to visit as part of a normal San Francisco trip. The headquarters area sits inside a modern office-and-lab district rather than a classic tourist corridor. Expect large office buildings, broad streets, biotech neighbors, and a more corporate feel than the older Mission District environment historically associated with OpenAI’s earlier years.
In other words, an “office tour” is usually going to mean one of two things: an invited visit for work, or a self-guided look at the outside of the Mission Bay campus from public streets. If you came looking for a formal tour product, OpenAI has not published one.
How the headquarters fits into OpenAI’s wider office network
San Francisco is still the center of gravity. OpenAI’s careers pages continue to list a large concentration of roles in San Francisco, while also showing hiring across other cities including Seattle, New York City, Washington, DC, London, Dublin, Singapore, Seoul, Sydney, Tokyo, Paris, Munich, and Delhi.[3] That tells you the headquarters matters operationally even as the company becomes more distributed.
OpenAI’s international office expansion started publicly with London, which the company announced in 2023 as its first international office.[5] Since then, the careers listings show a much broader footprint across Europe and Asia.[3] But the headquarters article should not overstate that shift. The evidence still points to San Francisco as the company’s main hub for leadership, engineering, recruiting, and company identity.[1][2][3]
That also explains why so many company-story pages orbit back to San Francisco. If you want the people dimension, read sam altman age, background, and religion or sam altman wife and personal life. If you want the corporate side, who owns openai? ownership structure explained is the better companion piece.
The short version is simple. OpenAI has become a global employer, but its headquarters remains a San Francisco story first.
Frequently asked questions
What is OpenAI’s headquarters address?
OpenAI’s own official pages list 1455 Third Street, San Francisco, CA 94158 as the company’s registered office address.[1][2] That is the cleanest address to use when you need a current headquarters reference.
Is OpenAI headquarters in San Francisco or somewhere else?
It is in San Francisco, specifically in the Mission Bay area.[1][2] OpenAI hires globally, but San Francisco remains the headquarters center of the company’s office network.[3]
Can the public tour OpenAI headquarters?
OpenAI does not publish a public headquarters tour or visitor program on the official pages reviewed for this guide.[1][2][3] For most people, any visit would need to be by invitation rather than as a public attraction.
Does OpenAI have only one office building?
No. Public reporting describes a larger Mission Bay footprint that includes 1455 and 1515 Third Street, 550 Terry A. Francois Boulevard, and a 2026 expansion at 1800 Owens Street.[6][7][8] That is why it makes sense to think of the headquarters as a campus.
What is the OpenAI office like inside?
OpenAI’s own San Francisco job postings describe open-plan offices with adjustable desks, conference rooms, phone booths, stocked kitchens, three in-house prepared meals daily, outdoor space, nap rooms, and bike storage.[4] That does not equal a full public tour, but it gives a credible picture of the workspace.
Does OpenAI have offices outside San Francisco?
Yes. Current careers pages show hiring in multiple cities outside San Francisco, including Seattle, New York City, Washington, DC, London, Dublin, Paris, Munich, Singapore, Seoul, Sydney, Tokyo, and Delhi.[3] OpenAI also said in 2023 that London was its first international office.[5]