OpenAI: The Full Story From a $1 Billion Nonprofit to a $852 Billion AI Empire

December 2015: The Dinner That Changed Everything

OpenAI was formally incorporated on December 11, 2015. The founding was not a spontaneous event. It grew out of a shared concern among a small group of technologists. They believed that the rapid advance of artificial intelligence at a few large corporations presented a civilisational risk. They wanted to create an organisation that would pursue this research openly, safely, and for the benefit of everyone.

The founding group was unusual in its breadth of talent. It included Sam Altman, then president of Y Combinator. It included Elon Musk, already the CEO of Tesla and SpaceX. It included Ilya Sutskever, who had been a core researcher at Google Brain and a student of Geoffrey Hinton. It included Greg Brockman, who had been CTO of Stripe. The full founding team of eleven people also included Trevor Blackwell, Vicki Cheung, Andrej Karpathy, Durk Kingma, John Schulman, Pamela Vagata, and Wojciech Zaremba.

Elon Musk and Sam Altman served as co-chairs. The organisation was structured as a nonprofit. The founding donors pledged $1 billion in total. The actual amount deployed in the early years was closer to $130 million, but the pledge demonstrated serious commitment. Early donors alongside the founders included Reid Hoffman, Jessica Livingston, Peter Thiel, Amazon Web Services, Infosys, and Y Combinator Research.

The Eleven Founders

Why They Feared Big Tech

The founding premise was not abstract. In 2015, Google had acquired DeepMind for approximately $500 million. Facebook had founded FAIR (Facebook AI Research). Amazon was building its own AI teams. The founders of OpenAI believed these organisations would accumulate enormous power through AI. They worried about who would benefit from that power.

Elon Musk, in particular, was alarmed by what he saw at Google. He had invested in DeepMind before its acquisition and later expressed regret that he had helped Google become more powerful in AI. This was part of his motivation for co-founding OpenAI. He later described the goal as building a counterweight to what he called a “Google-controlled” AI future.

• 2015
  December 11, 2015

  OpenAI Founded as a Nonprofit

  Eleven co-founders register OpenAI in San Francisco. $1 billion in total pledged funding. Sam Altman and Elon Musk are co-chairs. The mission is to develop AI safely and for all of humanity.

• 2016
  April 2016

  OpenAI Gym Released

  OpenAI releases its first public product: OpenAI Gym, a toolkit for developing and comparing reinforcement learning algorithms. It becomes the standard benchmark environment for RL research globally.

• 2018
  February 2018

  Elon Musk Resigns from the Board

  Musk steps down citing a potential conflict of interest with Tesla’s own AI development for autonomous vehicles. He later says he was refused control of the company by Altman and the board.

• 2019
  March 2019

  Capped-Profit Structure Created

  OpenAI creates a “capped-profit” subsidiary called OpenAI LP. Investors can receive returns capped at 100 times their investment. Anything beyond that goes back to the nonprofit. Sam Altman becomes CEO.

The GPT Architecture Begins

OpenAI’s first major research breakthrough came in June 2018. The company published a paper titled “Improving Language Understanding by Generative Pre-Training.” This introduced GPT-1, a language model trained on 117 million parameters and a large corpus of text from the internet. GPT-1 demonstrated that a model trained on a general language prediction task could be fine-tuned for specific applications without needing task-specific training data.

GPT-2 followed in February 2019. It was trained on 1.5 billion parameters. It was significantly more capable than GPT-1. The team decided not to release it fully because they believed it was too capable. They described it as a “credible risk” for generating convincing disinformation. This was the first major public debate about AI safety and release decisions. OpenAI eventually released GPT-2 fully in November 2019, after staged releases showed no significant misuse.

In July 2020, GPT-3 was released via API. It was trained on 175 billion parameters. It could write code, draft essays, translate languages, and generate creative fiction with a quality that astonished researchers. GPT-3 had over a million users within two months of limited access. It sparked widespread discussion about whether AI had crossed some qualitative threshold.

The Microsoft Partnership and the Capped-Profit Model

The transition to a capped-profit structure in 2019 was driven by necessity. Training large models requires enormous computational resources. A nonprofit cannot raise venture capital. OpenAI needed a different structure to attract the funding it required.

Microsoft invested $1 billion in OpenAI in July 2019. This was the first of several Microsoft investments that would eventually total over $13 billion. As part of the partnership, Microsoft provided access to its Azure cloud computing infrastructure. OpenAI used Azure to train its models. The two companies also agreed that Microsoft would have exclusive commercial licensing rights to any OpenAI technology that was deployed via Azure.

Codex and the GitHub Copilot Moment

In August 2021, OpenAI released Codex. It was a model trained on code from GitHub and 159 gigabytes of Python code. Codex could translate plain English instructions into working code. In June 2021, GitHub and Microsoft launched GitHub Copilot, powered by Codex. This was the first major AI product deployed inside a professional workflow at scale. GitHub Copilot became one of the fastest-growing developer tools in history. Over one million developers were using it within a year of launch.

November 30, 2022

ChatGPT launched on November 30, 2022. It was built on GPT-3.5 and trained using a technique called Reinforcement Learning from Human Feedback (RLHF). RLHF used human trainers to rank model outputs and then trained the model to produce responses that humans preferred. The result was a chatbot that was not just capable. It was accessible. Almost anyone could use it without technical knowledge.

The response was unlike anything the technology industry had seen before. ChatGPT reached one million users in five days. For context, Instagram took two and a half years to reach one million users. Twitter took two years. Netflix took three and a half years. ChatGPT did it in five days. By February 2023, two months after launch, it had 100 million monthly active users. This remains the fastest consumer product adoption in recorded history.

What Made It Different

Before ChatGPT, AI language models existed. GPT-3 was accessible via API. But they required technical knowledge to use. ChatGPT wrapped the model in a clean, conversational interface. It remembered the context of a conversation. It could revise its own answers. It apologised when it made mistakes. It felt like talking to someone who was very smart and extremely patient.

The model had weaknesses. It hallucinated facts confidently. It sometimes produced harmful content. It had a training cutoff date. But for most people encountering it for the first time, it was genuinely transformative. Teachers, lawyers, developers, journalists, and writers all found immediate applications. The AI boom of 2023 and 2024 traces its origin to November 30, 2022.

GPT-4 and the Subscription Model

GPT-4 was released on March 14, 2023. It was multimodal. It could understand both text and images. It performed at a level comparable to professionals on standardised tests. On the Uniform Bar Examination, GPT-4 scored in the top 10 percent of human test-takers. On the SAT, it scored 1410 out of 1600. These were not claims about AGI. They were demonstrations of capability across a very wide range of tasks.

OpenAI launched the ChatGPT Plus subscription at $20 per month in February 2023. This gave subscribers access to GPT-4 ahead of its public release, faster response times, and priority access during peak periods. By mid-2025, ChatGPT Plus had approximately 15 million active subscribers. The $200 per month ChatGPT Pro tier, launched later, gave access to OpenAI’s most powerful reasoning models with unlimited usage.

The crisis revealed something important about OpenAI’s structure. The nonprofit board had the legal authority to fire the CEO. But it had no power over the employees. And it had no power over Microsoft, which had already made a $13 billion commitment to OpenAI’s success. When 500 employees said they would leave, the board had no leverage. The company’s value was in the people. The people had made their choice.

The new board included Bret Taylor, former co-CEO of Salesforce, as chairman. Larry Summers, former US Treasury Secretary, also joined. The board’s composition shifted dramatically toward people with experience in large commercial organisations rather than pure AI safety researchers.

Every Major Model: 2018 to 2026

From $1 Billion Pledge to $122 Billion in a Single Round

• 2015 $1B pledged Founding pledges from Sam Altman, Elon Musk, Peter Thiel, Reid Hoffman, Jessica Livingston, Amazon Web Services, Infosys, and YC Research. Nonprofit structure. Actual spend in early years was closer to $130 million.
• Jul 2019 $1B Microsoft’s first investment. Announced alongside the capped-profit restructure. Azure cloud access provided as part of the deal. OpenAI’s valuation was not disclosed publicly.
• Jan 2021 $1B Second Microsoft investment round. Further deepened the Azure partnership. OpenAI used these funds to scale up compute for GPT-3 training and DALL-E development.
• Jan 2023 $10B Microsoft’s third and largest round, announced following the explosive success of ChatGPT. Total Microsoft investment by this point exceeded $13 billion. OpenAI valued at approximately $29 billion.
• Oct 2024 $6.6B Record private funding round at the time, led by Thrive Capital. Investors included Andreessen Horowitz, Sequoia Capital, Fidelity, and the UAE’s MGX. Valuation: $157 billion.
• Mar 2025 $40B Led by SoftBank alone. Broke the private funding record at the time. Post-money valuation: $300 billion.
• Mar 2026 $122B The largest private fundraise in history by a wide margin. Amazon led with $50 billion ($35B contingent on IPO or AGI by 2028). Nvidia contributed $30 billion. SoftBank contributed $30 billion. Post-money valuation: $852 billion.

Revenue Growth: 2023 to 2026

From Nonprofit to Public Benefit Corporation

OpenAI’s corporate evolution is unlike almost any other company. It began as a pure nonprofit in 2015. In 2019, it created a for-profit subsidiary with a 100x investor return cap. This structure worked for a few years. But as the company raised billions of dollars and employed thousands of people, the capped-profit model created problems. Investors needed clarity on returns. Employees needed equity that they could value and exercise. The nonprofit board had authority that could be exercised in ways that conflicted with commercial interests, as the November 2023 crisis demonstrated.

In 2024, OpenAI announced plans to convert into a fully for-profit company. The nonprofit would become a separate entity that might lose its controlling stake. This triggered significant public backlash. Former employees, legal scholars, and the attorneys general of California and Delaware all raised concerns about charitable assets being redirected for private profit.

In May 2025, OpenAI revised the plan. The nonprofit would retain control. On October 28, 2025, the restructure was completed. The for-profit arm became a Public Benefit Corporation (PBC) called OpenAI Group. The nonprofit was renamed the OpenAI Foundation. It holds a 26 percent equity stake in OpenAI Group, valued at approximately $130 billion.

The Elon Musk Lawsuit

In February 2024, Elon Musk filed suit against OpenAI and Sam Altman in San Francisco Superior Court. He alleged breach of contract. His claim was that OpenAI had abandoned its founding mission by creating a for-profit structure and partnering closely with Microsoft. He argued the company had shifted from building AI for humanity to building it for commercial profit.

The lawsuit attracted enormous attention. Musk had since founded his own AI company, xAI, which made him a direct competitor. OpenAI disputed his claims. On May 18, 2026, a jury ruled against Musk. The jury found his claims were time-barred. He had waited too long to file. The lawsuit was dismissed. The ruling cleared a significant legal obstacle from OpenAI’s IPO path.

The AI Race in 2026

$500 Billion for AI Infrastructure

On January 21, 2025, two days after his inauguration, President Donald Trump stood alongside Sam Altman, SoftBank CEO Masayoshi Son, and Oracle Chairman Larry Ellison at the White House. They announced the Stargate Project. Stargate is a joint venture with a target of investing $500 billion over four years in AI infrastructure in the United States. The initial equity funders are SoftBank, OpenAI, Oracle, and the UAE’s MGX. Microsoft, Arm, and Nvidia are technology partners.

$100 billion was committed immediately. The flagship Stargate campus is in Abilene, Texas, where Oracle began delivering NVIDIA GB200 racks in June 2025. By late 2025, the project had reached 8 gigawatts of planned capacity and over $450 billion in committed investment, ahead of the original schedule.

Stargate is not just a data center project. It is an energy project. Running 10 gigawatts of AI compute requires as much electricity as a small country. OpenAI and SoftBank invested $1 billion in SB Energy in January 2026 to build and operate a 1.2 gigawatt data center site in Milam County, Texas. The company is negotiating with Broadcom to design custom AI chips for its inferencing operations. Stargate represents OpenAI’s bet that whoever controls the compute will control the AI era.

The Confidential Filing: June 8, 2026

OpenAI submitted its confidential S-1 to the US Securities and Exchange Commission on June 8, 2026. The company announced it themselves the same day rather than waiting for it to leak, publishing a statement on its website that read: “We recently submitted a confidential S-1. We expect it to leak so we are just announcing it.” Goldman Sachs and Morgan Stanley are the confirmed lead underwriters. JPMorgan is also in discussions to join the syndicate. The company is targeting a public listing as early as September 2026. Discussions with Citigroup about joining the bank syndicate are also underway.

The timing was no accident. Three weeks before the announcement, on May 18, a jury ruled against Elon Musk’s lawsuit against OpenAI, finding his claims time-barred. The legal obstacle that had clouded OpenAI’s IPO preparation was removed. OpenAI filed three weeks later.

Sam Altman has targeted a September 2026 listing date. He noted publicly that initiating the filing process is not the same as being ready to list, and that some strategic moves may be easier to complete while OpenAI remains private. Market conditions, regulatory review, and investor appetite will all determine the final timing.

The Numbers the IPO Will Reveal

Disclaimer: This article is for informational and educational purposes only. It is not investment advice or a recommendation to buy, sell, or hold any security. All financial figures are sourced from company announcements, regulatory filings, and widely reported data at the time of writing (June 2026). OpenAI is a private company and has not yet filed a public S-1 prospectus; financial figures before the public filing are based on reported data and may be revised. IPO timing, valuation, and structure are subject to change. Fiscalzenith.com accepts no liability for decisions made in reliance on information contained in this article.