OpenAI files confidential S-1 with the SEC, one week after Anthropic

OpenAI confirmed on June 10, 2026 that it has submitted a confidential draft S-1 to the U.S. Securities and Exchange Commission, roughly a week after Anthropic disclosed its own IPO prospectus at a $965 billion valuation. The race that bankers have been quietly orchestrating for months is now openly on the tape.

The framing of the announcement is itself the story. "We expect it to leak so we're just announcing it," the company wrote, a sentence that compresses an entire posture toward narrative management into nine words. OpenAI added that "there are things we want to do that are likely easier as a private company," while noting the filing "gives us the option to go public sooner if that ends up being best." Translation: the optionality is the asset, not the listing itself.

The numbers explain why the option matters. OpenAI's most recent post-money valuation sits at $852 billion after a $122 billion funding round that closed in March, the largest private financing ever assembled. Yahoo Finance notes the company plans to spend heavily on infrastructure and model development, the kind of capex bill that eventually exhausts what even the deepest private syndicates can write. Goldman Sachs and Morgan Stanley are leading the process, per a Wall Street Journal report, with a potential fall listing and an employee tender offer in the works.

The competitive subtext is sharper than the valuation gap suggests. Investment bankers have told both companies that the first AI lab to list will set the categorization terms by which public-market investors price the entire sector, and capture the largest pool of capital in the process. SpaceX is preparing a listing on a parallel track. TechCrunch called the OpenAI filing "the latest signal that 2026 will be a blockbuster year for the public markets," and characterized the SEC under the current administration as having "taken a markedly more hands-off posture toward tech and AI companies than it did under previous administrations." That regulatory backdrop isn't incidental. It's the permission structure.

Then there's the Microsoft problem. On June 2, at its Build developer conference, Microsoft, a multibillion-dollar equity holder in both OpenAI and Anthropic, unveiled MAI-Code-1-Flash, its first in-house coding model, in what CNBC described as "a concerted effort to compete with proprietary models." A key partner is quietly building substitutes for the products it pays its partners to provide. Public-market disclosure obligations will make that dynamic legible in ways private filings never required.

CEO Sam Altman framed the moment as the start of a third phase for the company. "The economy is beginning to reshape around AI," he wrote, adding that "The central question now is how to make advanced AI abundant, affordable, safe, useful, and easy enough for every person and organization to benefit from it." The vocabulary of mission, deployed at the exact moment the mission acquires a ticker symbol, is the oldest move in the IPO playbook.

Sources

https://openai.com/news/
https://techcrunch.com/2026/06/08/following-anthropic-openai-files-confidentially-for-ipo/
https://fortune.com/2026/06/09/openai-files-confidential-s-1-sec-ipo/
https://finance.yahoo.com/markets/stocks/articles/openai-confidentially-files-ipo-sec-223341186.html
https://www.cnbc.com/2026/06/02/microsoft-unveils-new-ai-models-lessen-reliance-on-openai-lower-costs.html