OpenAI's staggering $852 billion valuation is under a new kind of pressure not from regulators or rivals in a lab, but from its own investors. According to a recent Financial Times report, a number of backers who once wrote enthusiastic checks are now questioning whether the math still adds up, especially as Anthropic's trajectory grows harder to ignore.
The unease isn't coming from nowhere. It's rooted in a shifting competitive reality where Anthropic, once considered a promising but distant second player, has started to look like a genuine threat to OpenAI's dominance in the enterprise AI space.
A Revenue Surge That Demands Attention
The numbers tell a striking story. Anthropic's annualized revenue skyrocketed from $9 billion at the close of 2025 to $30 billion by the end of March 2026 a more than threefold increase in roughly three months. The catalyst? Surging demand for its coding tools, which have rapidly become a go-to for developers and engineering teams across industries.
That kind of growth reframes the entire competitive picture. One investor who has backed both Anthropic and OpenAI told the Financial Times that justifying OpenAI's latest round required projecting an IPO valuation of $1.2 trillion or higher. Against that backdrop, Anthropic's $380 billion valuation raised in its Series G earlier this year starts to look like a relative bargain.
Secondary Markets Tell Their Own Story
Perhaps no signal is louder than what's happening in the secondary markets. Demand for Anthropic shares has become, in the words of market watchers, nearly insatiable. Investors are scrambling to get exposure before a potential public listing. Meanwhile, OpenAI shares are trading at a discount to their last primary round a troubling indicator of cooling sentiment around the company Sam Altman built.
The contrast is stark and increasingly difficult for OpenAI's leadership to explain away. When your biggest competitor's stock is white-hot and yours is losing heat on secondaries, it's more than a narrative problem it's a valuation problem.
The Netscape Comparison
The most cutting critique came from Jai Das, president of Sapphire Ventures, who holds no stake in either company. He compared OpenAI to Netscape the browser pioneer that once seemed invincible but was ultimately overtaken by Microsoft and absorbed by AOL. It's a historical parallel that stings because it implies not just decline, but irrelevance.
OpenAI CFO Sarah Friar has pushed back against the growing skepticism, pointing to the company's record-breaking $122 billion raise the largest private fundraising in history as proof that investor confidence remains strong. But a mega-raise and genuine conviction aren't always the same thing, especially when the terms and motivations of late-stage investors can be complex.
What Comes Next
The AI industry is entering a phase where revenue growth, not just model benchmarks, is becoming the primary measure of success. On that metric, Anthropic is currently winning and winning decisively. Whether OpenAI can pivot its enterprise strategy fast enough to close the gap, or whether Altman's ambitions will ultimately prove justified at these valuations, remains one of the most consequential questions in tech.
For now, the momentum belongs to Anthropic. And in venture capital, momentum is everything.
