Anthropic Just Filed for an IPO and It Beat OpenAI to the Punch

The race to define how AI companies are valued on public markets just got a lot more interesting. Anthropic, the company behind Claude, has confidentially filed for a US initial public offering and, in doing so, quietly stole the narrative from its most prominent rival before OpenAI could get there first.

What Happened

Anthropic confirmed on Monday that it has submitted a confidential IPO filing with US regulators. The company didn't disclose the size of the offering or any pricing terms. Confidential submissions allow companies to advance their preparations without revealing sensitive financial details to competitors or the public until they're ready.

What is known is the valuation. Anthropic's most recent funding round in late May pegged the company at $965 billion, just shy of a trillion dollars, and significantly ahead of OpenAI. That figure represents more than a doubling of its $380 billion valuation from February, when it raised $30 billion from a mix of Silicon Valley and Wall Street investors, including Blackstone, Brookfield, General Catalyst, and Singapore's GIC.

At that valuation, a successful listing would vault Anthropic into the very top tier of the S&P 500 alongside a handful of companies that genuinely shape global equity markets.

The Race Nobody Expected to Be This Close

For months, conventional wisdom in financial circles held that OpenAI would be the first major AI lab to go public. Prediction markets had OpenAI as the clear favourite to file first. Sam Altman's company has the larger public profile, the bigger user base in ChatGPT, and the more recognisable brand name outside of technology circles.

Anthropic didn't care about any of that. It filed anyway, and now OpenAI is the one watching from the sidelines.

Altman's response to the news was characteristically measured. Speaking to CNBC, he said he isn't focused on the timing of OpenAI's IPO and that the company will go public when it makes sense to do so. Which is a reasonable position, and also the only thing you can say when your rival just beat you to the starting line.

The strategic calculus here is genuinely interesting. Harrison Rolfes, a senior analyst at PitchBook, offered two competing reads. The conventional interpretation is that Anthropic has seized the narrative advantage by filing first. The less obvious interpretation is that OpenAI may have gotten the better end of this situation because Anthropic has now volunteered to absorb all the disclosure risk first, and OpenAI can watch how institutional investors react to audited frontier AI financials before deciding on its own pricing and timing.

Both readings have merit. The one that turns out to be correct will depend almost entirely on how the market receives Anthropic's numbers when they become public.

Why the Timing Matters

Anthropic's filing comes hot on the heels of SpaceX's mega-IPO, which is pursuing a $75 billion offering at a $1.75 trillion valuation and could begin trading within weeks. The sequencing is deliberate.

"Filing shortly after SpaceX allows Anthropic to capitalise on strong investor interest in AI and growth stocks while the window remains favourable," said Kat Liu, vice president at IPO research firm IPOX.

That window is real. The IPO market has recovered meaningfully in 2026, with companies raising $87.5 billion globally through late May, the highest year-to-date total since 2021, according to Dealogic. Several significant listings are already queued up for this week alone, including quantum computing firm Quantinuum and mobile marketing platform Liftoff.

The concern, raised openly by analysts including D.A. Davidson's Gil Luria, is that the combined capital demands of SpaceX, Anthropic, and OpenAI are so enormous that they risk crowding each other out. There is a finite pool of institutional investor money, and three near-trillion-dollar companies competing for it simultaneously creates genuine market pressure. Going early is a real advantage, which is presumably part of why Anthropic moved when it did.

What Anthropic Is Actually Selling

Beyond the headline valuation, Anthropic is making a specific kind of pitch to public market investors. The company has positioned itself around AI safety and reliability, building systems that are, in its framing, more trustworthy and controllable than competitors. Claude Code, its agentic coding assistant, has become one of its most commercially visible products and a credible competitor to GitHub Copilot and other developer tools.

The rapid rise in Anthropic's valuation earlier in 2026 wasn't universally welcomed, as its increasingly autonomous AI tools triggered sharp selloffs in software and IT stocks as investors worried about disruption to established business models. That's the kind of market impact that tends to follow a company into its IPO filing as a risk factor worth scrutinising.

A confidential filing means the process is underway, but the public debut is still some distance away. Regulators review the submission, the company responds to any questions, and eventually a public S-1 filing follows, at which point the financial details that investors and competitors alike have been speculating about become visible.

For Anthropic, the question the market will ultimately answer is whether a company valued at close to a trillion dollars can justify that number through its actual revenue, growth trajectory, and path to profitability. Frontier AI companies burn through capital at a pace that makes conventional valuation metrics difficult to apply, and the IPO process will force a level of financial transparency that private funding rounds never required.

The race is on. Anthropic moved first. Now everyone is watching to see what the numbers actually say.