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Sam Altman (born Samuel Harris Altman; April 22, 1985) is an American entrepreneur, investor, and technology executive who serves as the chief executive officer of OpenAI, the artificial intelligence research laboratory behind ChatGPT, GPT-4, and GPT-5. He is also the chairman of Tools for Humanity, the company behind the World (formerly Worldcoin) biometric identity and cryptocurrency project. Before leading OpenAI, Altman was the president of Y Combinator, one of Silicon Valley's most influential startup accelerators, from 2014 to 2019.[2]
Altman has been described as one of the most influential figures of the AI boom, a characterization cemented by the explosive global adoption of ChatGPT following its launch in November 2022. His tenure at OpenAI has also been marked by significant controversy, most notably his brief firing and reinstatement by the company's board of directors in November 2023, ongoing debates about the balance between AI safety and commercial deployment, and the company's transformation from a nonprofit research lab into one of the world's most valuable technology companies.
Samuel Harris Altman was born on April 22, 1985, in Chicago, Illinois, to a Jewish American family. His mother, Connie Gibstine, is a dermatologist, and his father, Jerry Altman, was a real estate broker. The family moved to the suburbs of St. Louis, Missouri, when Sam was a young child. He has three younger siblings: brothers Jack and Max, and a sister, Ann.[3]
Altman attended John Burroughs School, an elite preparatory school in the St. Louis area. He showed an early aptitude for mathematics and computing, and received his first computer, a Macintosh, at the age of eight. During high school, Altman came out as gay, addressing the school assembly directly and advocating for the establishment of "Safe Space" support initiatives for LGBTQ+ students.[4]
In 2003, Altman enrolled at Stanford University to study computer science. He left after two years without completing his degree. He would later remark that he learned more playing poker with his classmates than he did attending lectures by professors.[5] His departure from Stanford was driven less by dissatisfaction with the university than by an opportunity he could not pass up: Paul Graham's newly launched Y Combinator program, which actively encouraged technically strong students to build companies rather than finish their degrees.
In 2005, at the age of 19, Altman co-founded Loopt, a location-based social networking mobile application, with Nick Sivo and Alok Deshpande. Loopt was one of eight companies in Y Combinator's inaugural Summer Founders Program, receiving $6,000 per founder along with mentorship from Paul Graham and his team.[6]
As CEO, Altman raised more than $30 million in venture capital for Loopt. The initial $5 million investment came from Patrick Chung of Xfund and New Enterprise Associates, followed by investments from Sequoia Capital and Y Combinator. Loopt allowed users to share their real-time locations with friends through their mobile phones, a concept that was ahead of its time in the pre-smartphone era.
Despite the funding and early buzz, Loopt never achieved significant user traction. In March 2012, the company was acquired by Green Dot Corporation, a financial services firm, for $43.4 million. While the acquisition returned capital to investors, it was widely viewed as a modest outcome relative to the company's ambitions and the amount of venture capital raised.[7]
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In 2011, Altman joined Y Combinator as a part-time partner. In 2012, he co-founded Hydrazine Capital, a venture fund, with his brother Max Altman. In February 2014, Paul Graham personally selected Altman to succeed him as president of Y Combinator.[8]
During his tenure as president (2014-2019), Altman oversaw a significant expansion of Y Combinator. By the time he stepped down, the accelerator had funded approximately 1,900 companies. Notable companies that went through Y Combinator during this period or earlier include Airbnb, DoorDash, Instacart, Reddit, Stripe, and Twitch. The program provided startups with $500,000 in funding in exchange for equity stakes, along with intensive mentorship and access to YC's network of alumni and investors.[9]
Altman also pursued a number of side projects during his time at Y Combinator. He launched YC Research, a nonprofit research lab, and OpenAI (in 2015) as a separate entity. In 2016, he briefly explored running for governor of California but did not pursue the idea further.[10]
In December 2015, Altman co-founded OpenAI as a nonprofit artificial intelligence research organization alongside Elon Musk, Greg Brockman, Ilya Sutskever, and several other researchers, including Andrej Karpathy, John Schulman, Wojciech Zaremba, and others. The venture was announced with $1 billion in pledged funding from Altman, Musk, Peter Thiel, Amazon Web Services, and other donors.[11]
The stated mission of OpenAI was to ensure that artificial general intelligence (AGI) benefits all of humanity. Altman and Musk both cited concerns about AI safety as a motivating factor, arguing that the development of powerful AI systems should not be concentrated in the hands of a single corporation, particularly Google, which had acquired DeepMind in 2014.
Elon Musk departed OpenAI's board in February 2018, citing a potential conflict of interest with Tesla's own AI research efforts. Musk later became a vocal critic of OpenAI's direction, particularly after the organization's shift toward a for-profit structure.[12]
In 2019, OpenAI created a "capped-profit" subsidiary, OpenAI LP, in which investors' returns were capped at 100 times their investment. The original nonprofit board retained oversight and control. Altman took on the role of CEO of the new entity, stepping down from his position at Y Combinator to focus on OpenAI full time.[13]
The restructuring was controversial. Critics argued that it represented a betrayal of OpenAI's founding mission as an open, nonprofit research organization. Supporters countered that the enormous capital requirements of training frontier AI models made a purely nonprofit structure unsustainable. Microsoft invested $1 billion in OpenAI in July 2019, becoming the company's primary cloud partner and a close commercial ally.[14]
OpenAI launched ChatGPT on November 30, 2022, and the product became one of the fastest-growing consumer applications in history, reaching an estimated 100 million users within two months. Built on the GPT-3.5 architecture and later upgraded to GPT-4, ChatGPT demonstrated the power of large language models to a mass audience and triggered a global wave of investment, competition, and public debate about the implications of advanced AI.[15]
Altman became the public face of this AI boom. He embarked on a global tour in 2023, meeting heads of state, testifying before the US Congress, and speaking at events around the world. During his testimony before the Senate Judiciary Subcommittee on Privacy, Technology, and the Law on May 16, 2023, Altman called for the creation of a new US regulatory agency for AI and expressed support for licensing requirements for frontier AI models, drawing comparisons to the regulation of nuclear energy.[16]
On November 17, 2023, OpenAI's board of directors abruptly fired Altman as CEO. The board issued a brief statement saying it had lost "confidence in his ability to continue leading OpenAI" and that Altman had not been "consistently candid in his communications with the board." Chief Technology Officer Mira Murati was named interim CEO.[17]
The firing triggered one of the most dramatic episodes in recent Silicon Valley history. The events unfolded over five chaotic days:
| Date | Event |
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| November 17, 2023 | Board fires Altman; Mira Murati named interim CEO; Greg Brockman resigns as board chairman |
| November 18, 2023 | Reports emerge that investors are pushing for Altman's reinstatement; Altman visits OpenAI offices wearing a guest badge |
| November 19, 2023 | Board appoints Emmett Shear (former Twitch CEO) as interim CEO; Microsoft CEO Satya Nadella announces Altman and Brockman will join Microsoft |
| November 20, 2023 | Over 700 of OpenAI's approximately 770 employees sign a letter threatening to quit if Altman is not reinstated and the board does not resign; Ilya Sutskever, who initially supported the firing, publicly states "I regret my participation in the board's actions"; OpenAI announces "agreement in principle" for Altman to return |
| November 21, 2023 | Altman is officially reinstated as CEO with a new board consisting of Bret Taylor (chairman), Lawrence Summers, and Adam D'Angelo |
The precise reasons behind the board's decision have been the subject of extensive reporting and speculation. According to later investigations, the board had been concerned about Altman withholding information (for example, about the release of ChatGPT and his ownership stake in OpenAI's startup fund), providing inaccurate information about safety processes, and what two executives described as "psychological abuse."[18] The incident raised fundamental questions about corporate governance in the AI industry and the tension between safety-oriented oversight and commercial momentum.
Under Altman's continued leadership, OpenAI has released a rapid succession of models and products:
| Product / Model | Release Date | Key Features |
|---|---|---|
| GPT-4 Turbo | November 2023 | 128k context window, lower pricing, improved instruction following |
| GPT-4o | May 2024 | Omni model with native multimodal capabilities (text, vision, audio) |
| o1 | September 2024 (preview), December 2024 (full) | Reasoning model that "thinks" before answering |
| o3 | December 2024 (preview), April 2025 (general availability) | Next-generation reasoning model; scored 87.5% on ARC-AGI benchmark |
| GPT-4.5 | February 2025 | Final non-chain-of-thought model |
| GPT-5 | August 7, 2025 | Flagship model unifying reasoning and generation; improved coding, reasoning, medical applications |
| GPT-5.2 | December 2025 | Improved reasoning capabilities |
| GPT-5.4 | March 2026 | Frontier model for professional work and long-running agents |
Altman described GPT-5 as a "unification" of OpenAI's separate model lines, merging the GPT series (optimized for broad capability) with the o-series (optimized for reasoning) into a single coherent system.[19]
On October 28, 2025, OpenAI completed its transformation from a hybrid nonprofit/capped-profit structure into a Public Benefit Corporation (PBC), ending years of debate about the company's governance. The restructuring converted the for-profit entity into OpenAI Group PBC, while the original nonprofit was reconstituted as the OpenAI Foundation, which retained a 26% ownership stake. Microsoft held 27%, and the remaining 47% was distributed among other investors and employees.[20]
Under the new structure, Altman received equity in OpenAI for the first time. Previously, he had famously held no equity in the company and earned an annual salary of $76,001. The restructuring was a precondition for OpenAI's path toward a potential initial public offering.[20]
OpenAI's valuation has grown at an extraordinary pace:
| Date | Valuation | Funding Round / Event |
|---|---|---|
| January 2024 | $86 billion | Secondary market transactions |
| October 2024 | $157 billion | $6.6 billion funding round |
| March 2025 | $300 billion | Funding round led by SoftBank |
| March 2026 | $730 billion | Various estimates |
| February 2026 | $840 billion | $110 billion funding round |
OpenAI is targeting an IPO in the second half of 2026, with the public offering expected to value the company at over $1 trillion.[21]
Altman is the chairman and co-founder of Tools for Humanity, the company behind the World project (formerly known as Worldcoin). He co-founded the company in 2019 with Alex Blania and Max Novendstern. The project aims to create a global identity and financial network by providing every person on Earth with a verified digital identity (World ID) using biometric iris scanning through a device called the Orb.[22]
The World project launched publicly in July 2023 and was rebranded from Worldcoin to World in 2024. It combines three components: World ID (a privacy-preserving digital identity), a cryptocurrency token (WLD), and the World App, a digital wallet.
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The project has faced significant regulatory challenges. Multiple countries have investigated or restricted World's operations over privacy concerns related to biometric data collection. In October 2025, the Philippines' National Privacy Commission issued a cease and desist order against Tools for Humanity for violations of the Data Privacy Act, directing the company to stop all collection and processing of personal data, including iris scans, in the Philippines.[23]
Altman has argued that World ID will become increasingly important as AI-generated content makes it harder to distinguish between real humans and bots online, framing the project as a necessary piece of infrastructure for the AI age.
Altman testified before the US Senate Judiciary Subcommittee on Privacy, Technology, and the Law on May 16, 2023, in a hearing titled "Oversight of A.I.: Rules for Artificial Intelligence." He was one of three AI experts who testified, alongside IBM's Christina Montgomery and NYU professor Gary Marcus. During the hearing, Altman expressed support for government regulation of AI, proposed the creation of a new federal regulatory agency, and suggested a licensing and testing regime for frontier AI models. Senator Richard Blumenthal opened the hearing by playing a deepfake audio clip of his own voice generated by AI, underscoring the urgency of the regulatory questions at hand.[16]
In 2023, Altman undertook a widely publicized world tour, meeting with leaders in Europe, the Middle East, Asia, and Africa. The tour served both as a diplomatic effort to shape global AI policy and as a commercial initiative to build relationships in key markets. He met with heads of state including French President Emmanuel Macron, Indian Prime Minister Narendra Modi, South Korean President Yoon Suk-yeol, and Nigerian President Bola Tinubu, among others.[24]
In 2025, Altman was named among the "Architects of AI" as part of Time magazine's Person of the Year recognition, reflecting his central role in the public emergence of generative AI.[25]
Altman's leadership style has been the subject of both admiration and sharp criticism. Supporters credit him with the vision and drive that turned OpenAI from a small nonprofit into the most influential AI company in the world. Critics have raised concerns about his management practices, his accumulation of power, and the tension between OpenAI's stated safety mission and its commercial ambitions.
The departure of several senior safety researchers from OpenAI has fueled criticism that the company under Altman's leadership has prioritized product development over safety research. In May 2024, Jan Leike, co-lead of OpenAI's Superalignment team, resigned and joined Anthropic. In his departure message, Leike accused the company of letting "safety culture and processes take a back seat to shiny products" and said the team had been "sailing against the wind" for months, struggling to access the computing resources needed for safety research despite OpenAI's promise to dedicate a fifth of its compute to the effort.[26]
Ilya Sutskever, OpenAI's co-founder and former chief scientist, who was a central figure in the November 2023 board crisis, also departed the company in May 2024 to found Safe Superintelligence Inc. (SSI), a startup focused exclusively on AI safety.[27]
Critics have argued that the events of November 2023 exposed a fundamental weakness in OpenAI's governance structure: the nonprofit board, designed to serve as a check on the company's commercial ambitions, was unable to withstand the pressure from investors, employees, and commercial partners when it attempted to exercise its oversight authority. The reconstituted board was widely seen as more aligned with Altman's vision and less likely to challenge his leadership.
Former chief technology officer Mira Murati reportedly told staffers in 2023 that she did not feel "comfortable about Sam leading us to AGI." Ilya Sutskever expressed similar reservations, saying: "I don't think Sam is the guy who should have the finger on the button for AGI." Dario and Daniela Amodei, who left OpenAI in 2021 to found Anthropic, reportedly described Altman's tactics as "gaslighting" and "psychological abuse."[28]
In January 2025, Altman's sister Ann Altman filed a lawsuit in the US District Court for the Eastern District of Missouri alleging sexual abuse by Sam Altman, claiming the abuse started when she was three years old and Sam was twelve. Sam Altman, along with his mother Connie and brothers Max and Jack, issued a joint statement calling the allegations "utterly untrue." The case remains pending as of early 2026.[29]
Altman came out as gay during high school. He married Oliver Mulherin, an Australian software engineer, in an intimate seaside ceremony near his home in Hawaii on January 10, 2024. The couple had been in a relationship for several years and were first publicly seen together at a White House dinner in 2023. They have a son, born in 2025.[30]
Altman is a prepper and has spoken publicly about his preparations for civilizational disruptions, including stockpiling supplies and owning firearms. He has also been open about his interest in life extension and has invested in several longevity-related startups.[31]
In May 2024, Altman and Mulherin signed The Giving Pledge, committing to give away the majority of their wealth during their lifetimes or in their wills.[32]
As of December 2025, Forbes estimated Altman's net worth at approximately $2.1 billion. Notably, this wealth was not derived from OpenAI, in which Altman held no equity until the October 2025 PBC restructuring. Instead, the bulk of his fortune comes from early-stage investments in companies including Reddit, Uber, Asana, Airbnb, Stripe, Instacart, and Pinterest, as well as venture capital investments made through Hydrazine Capital and other vehicles. He also holds significant real estate and land assets.[1]
Altman's annual salary as CEO of OpenAI has been reported as $76,001. Following the October 2025 restructuring, he received equity in OpenAI for the first time, which, depending on the company's eventual public market valuation, could substantially increase his net worth.[20]
| Source of Wealth | Details |
|---|---|
| Early-stage investments | Reddit, Uber, Airbnb, Asana, Stripe, Instacart, Pinterest, and others |
| Hydrazine Capital | Venture fund co-founded with brother Max Altman in 2012 |
| Real estate | Significant land and property holdings |
| OpenAI equity | Received as part of October 2025 PBC restructuring |
| Tools for Humanity | Chairman; value tied to World/WLD token and company equity |
| Salary (OpenAI) | $76,001 per year |