Anthropic is attracting the kind of private-market fervor usually reserved for once-in-a-generation listings. But the higher its prospective IPO valuation climbs, the more exposed it becomes to a blunt question: can explosive AI revenue outrun regulation, competition and customer cost-cutting?

The rally gathered pace after Anthropic filed IPO paperwork with the Securities and Exchange Commission in June. The Claude maker had announced annualized revenue above $47 billion in May, and investors now project $100 billion to $120 billion by the end of 2026. Some backers believe an autumn listing could value the company at $2 trillion or more—potentially the biggest IPO on record. “If Anthropic is growing 800 percent a year,” one investor said, “at the incredibly low end they would trade at 30 times [revenue].”¹

Secondary markets have already supplied a taste of that optimism. Shares have reportedly changed hands at valuations as high as $1.5 trillion, up 25% in a month, with buyers scrambling to get ahead of a flotation and few holders prepared to sell. “Even at that number, there aren't a lot of sellers out there,” Rainmaker Securities chief executive Glen Anderson said.²

Yet the bullish case is not uncontested; it is being stress-tested in real time. A temporary Commerce Department ban forced Anthropic to pull its leading models, Fable 5 and Mythos 5, in June, unsettling customers and contributing to slower revenue growth that month. The company is also fighting the Defense Department after it labeled Anthropic a supply-chain risk.

The commercial pressure is equally stark. Anthropic’s top model costs more than two and a half times OpenAI’s flagship, while Chinese open-weight alternatives are far cheaper. Businesses still expanded Anthropic usage last month, but Ramp analysts found customers were “hitting their limit on AI spend” and shifting toward lower-cost options.¹ The IPO thesis rests on Anthropic staying the performance leader; the market’s looming verdict will be on whether that lead is worth the premium.