Who Is Sam Altman, the Chief Executive Officer of OpenAI?

Sam Altman is the chief executive officer (CEO) of OpenAI and an active venture capital investor.

At Layer3Labs, we build artificial intelligence (AI) agents for business workflows, so we follow who runs the labs that build the models our agents use.

Before taking over OpenAI as CEO in 2019, Altman co-founded the mobile application Loopt and served as the president of startup accelerator Y Combinator from 2014 to 2019.

Sam Altman in Brief

Altman is the chief executive officer of OpenAI, which he co-founded in 2015 before becoming its CEO in 2019, according to Wikipedia. In September 2026, he ruled out an OpenAI initial public offering (IPO) during 2026.

Before OpenAI, Altman was a software founder and accelerator executive. He co-founded the social networking application Loopt in 2005, joined startup accelerator Y Combinator as a part-time partner in 2011, and led Y Combinator as president for five years.

Beyond OpenAI, Altman has backed energy, longevity, and brain-computer interface companies. Forbes notes that Altman holds no equity stake in OpenAI, with his personal fortune coming from his investments.

• Current Role: Chief Executive Officer of OpenAI (since 2019; co-founder since 2015).
• Previous Executive Leadership: President of Y Combinator (2014 to 2019); Co-founder of Loopt (2005 to 2012).
• Key Companies and Boards: Co-founder and Chairman of Tools for Humanity; Co-founder of Merge Labs; former Chairman of Oklo and Helion Energy.
• Education: Studied computer science at Stanford University for two years before leaving without a bachelor's degree.
• Recent Developments: OpenAI closed a $122 billion funding round at an $852 billion valuation in March 2026, and in September 2026 Altman ruled out an OpenAI IPO for 2026.

Early Career: Loopt and Y Combinator

Altman began his software career after leaving Stanford University, where he studied computer science for two years without completing a degree, according to Wikipedia. In 2005, he co-founded Loopt, a location-based social networking mobile application.

Loopt was in the very first batch funded by Y Combinator, in 2005, as recounted by accelerator co-founder Paul Graham. Loopt failed to gain significant user traction. In March 2012, Green Dot Corporation acquired Loopt for $43.4 million, an exit that Forbes summarizes as an approximately $43 million sale.

In April 2012, Altman co-founded the venture firm Hydrazine Capital. Altman had already begun working with Y Combinator as a part-time partner in 2011.

On February 21, 2014, Paul Graham announced that Altman would become president of Y Combinator starting with the next batch. Graham wrote that Altman "understands startups better than perhaps anyone I know, including myself." Forbes records his tenure as Y Combinator president from 2014 through 2019.

In March 2019, Altman stepped back from running Y Combinator day to day, transitioning into a chairman role while other partners assumed operational control, as reported by TechCrunch. Altman made the change as he focused on OpenAI.

Founding and Commercial Growth of OpenAI

Altman co-founded OpenAI in 2015 to pursue artificial general intelligence (AGI). In his essay Reflections, Sam Altman explained that the founders started OpenAI because they believed that building AGI was technically possible. Altman formally assumed the role of chief executive officer of OpenAI in 2019.

On February 27, 2026, OpenAI announced that ChatGPT had achieved 900 million weekly active users and 50 million paying subscribers, according to TechCrunch. Our breakdown of ChatGPT subscription pricing lists the paid plans.

On March 31, 2026, OpenAI closed a $122 billion funding round at an $852 billion valuation, as reported by TechCrunch. By September 29, 2026, TechCrunch cited Bloomberg reports indicating OpenAI was in talks to raise at least $30 billion at a valuation of roughly $1.4 trillion ahead of a 2027 listing.

In February 2026, Altman announced that OpenAI had hired OpenClaw creator Peter Steinberger to work on personal agents, per The Register. You can read more about Steinberger's background in our profile on who Peter Steinberger is. OpenAI's developer tooling is covered in our guide on how OpenAI Codex works.

The November 2023 Ouster and Reinstatement

On November 17, 2023, the board of directors of OpenAI abruptly fired Altman as chief executive officer. The board publicly justified the dismissal by stating that Altman was not consistently candid in his communications, according to Wikipedia. Writing about the experience about a year later on his blog, Altman stated that he was fired by surprise on a video call.

The board briefly named chief technology officer (CTO) Mira Murati as interim CEO, as reported by Fortune. To understand her leadership role during and after this period, review our profile on who Mira Murati is. Nearly all of OpenAI's roughly 770 employees signed a letter threatening to resign unless the board reinstated Altman.

Co-founder Ilya Sutskever, who sat on the board that removed Altman, publicly stated that he regretted his role in the ouster. On November 21, 2023, negotiations yielded an agreement for Altman and Greg Brockman to return. Fortune reported that OpenAI formally finalized Altman's reinstatement as CEO on November 29, 2023.

The reinstatement established a reconstructed initial board consisting of chairman Bret Taylor, former United States Treasury Secretary Larry Summers, and Adam D'Angelo. Microsoft, OpenAI's largest investor, joined the board as a non-voting observer. An independent investigation by law firm WilmerHale concluded in March 2024 that Altman's conduct did not mandate removal, and Altman officially rejoined the OpenAI board, as reported by the Hawaii Tribune-Herald.

For profiles of other AI executives, see who Dario Amodei is and our list of AI leaders and researchers to watch.

Corporate Restructuring and Legal Battles

On October 28, 2025, OpenAI completed a recapitalization. As detailed by Fortune, OpenAI converted its commercial arm into the OpenAI Group Public Benefit Corporation, while keeping ultimate governance under the nonprofit foundation. The attorney general of Delaware issued a formal statement of no objection to the restructuring.

Microsoft received a 27% stake in OpenAI valued at approximately $135 billion under the terms of the recapitalization. Reuters reported that OpenAI confirmed Altman would not receive an equity stake in the newly restructured entity.

OpenAI and Altman also defeated a lawsuit brought by early backer Elon Musk. Musk invested $38 million in OpenAI in its early years before suing in 2024. On May 18, 2026, a federal jury in Oakland rejected Musk's claims, finding that Musk filed his lawsuit too late, as reported by Al Jazeera. Judge Yvonne Gonzalez Rogers said that substantial evidence supported the jury verdict.

Model Deployments and Public Market Timeline

On September 3, 2026, OpenAI initiated the release of GPT-6 Astra, beginning with business testers enrolled in its Daybreak program, as reported by Bloomberg via Bloomberg Government. A guarded version is planned for paid ChatGPT users. For the release details, see our explainer on OpenAI Astra and our evaluation of whether GPT-6 Astra represents AGI.

On September 30, 2026, OpenAI launched Dots. Fortune reported that Dots functions as an always-available personal assistant that accepts tasks through chat interfaces, Slack, and Microsoft Teams.

Despite public listing preparations, Altman has delayed an initial public offering. OpenAI announced on June 8, 2026, that it had confidentially filed for an IPO, according to TechCrunch. In an interview published on September 12, 2026, Altman stated directly to Fortune that an IPO would not happen in 2026.

Altman said "right now would be an ill-advised moment to go public," tying the delay to AI safety rather than market conditions. He told Fortune that OpenAI will list when the business and the broader moment in society are ready.

Perspectives on Artificial General Intelligence and Safety

Altman has set out his expectations for artificial general intelligence in essays on his blog. In his blog post Reflections, Altman stated that OpenAI researchers are confident they understand how to build AGI as traditionally defined. He added that the organization is beginning to turn its aim beyond AGI, to superintelligence.

In a 2025 essay titled The Gentle Singularity, Altman argued that "we are past the event horizon". Altman wrote that the takeoff phase has started, predicting that "2026 will likely see the arrival of systems that can figure out novel insights."

At the same time, Altman has voiced concern about the risk of AI-driven extinction. In a September 2026 interview covered by Business Day, Altman called even a 10% chance of AI-driven extinction unacceptable. "Whether it's 10 or eight or six, the point is, we all have a tremendous amount of responsibility," he said.

Outside Companies and Investments

In 2019, Altman co-founded Tools for Humanity alongside chief executive Alex Blania to create World, formerly known as Worldcoin, according to Wikipedia. TechCrunch identified Altman as co-founder and chairman of Tools for Humanity.

In April 2026, World announced proof-of-human identity verification partnerships including Tinder, Zoom, and DocuSign, as reported by TechCrunch. Altman explained the need by saying, "We are also heading to a world now where there's going to be more stuff generated by AI than by humans."

In 2021, Altman led a $500 million investment round in nuclear fusion startup Helion Energy, according to Fortune. In March 2026, Altman stepped down as Helion's board chair amid reported clean-energy supply negotiations between Helion and OpenAI, per TechCrunch.

Nuclear startup Oklo went public in May 2024 through Altman's special purpose acquisition company (SPAC), AltC Acquisition Corp. In April 2025, Altman stepped down as Oklo chairman, with co-founder Jacob DeWitte taking over as chairman, per Yahoo Finance. In other sectors, Altman invested $180 million into longevity firm Retro Biosciences per Fortune, and co-founded brain-computer interface startup Merge Labs, which closed a $252 million seed round backed by OpenAI in January 2026, as reported by The Decoder.

Net Worth Estimates and Executive Compensation

Altman's personal wealth derives from venture investments instead of compensation or ownership in OpenAI. As of October 5, 2026, Forbes estimates Altman's net worth at $3.3 billion, noting that he holds no equity in OpenAI and accumulated his fortune through stakes in Stripe, Reddit, and Helion Energy. Earlier, Reuters via Yahoo Finance cited a May 2026 Forbes estimate placing his fortune at $4 billion.

On March 1, 2024, the Bloomberg Billionaires Index published its first valuation of Altman's net worth, estimating his fortune to be at least $2 billion, as reported by Fortune.

By contrast, his formal executive compensation at OpenAI is modest. The nonprofit's Internal Revenue Service (IRS) filing showed that Altman received $76,001 in annual compensation in 2023, compared to $73,546 in 2022, per Fortune. To evaluate the underlying asset portfolio and venture stakes, review our detailed guide on Sam Altman's net worth and investments.