For years, Anthropic lived in OpenAI's shadow. That chapter is officially over.

On May 28, 2026, Anthropic announced a staggering $65 billion Series H funding round, vaulting the company to a $965 billion valuation — surpassing rival OpenAI's $852 billion mark and crowning Anthropic as the world's most valuable AI startup. This reflects a fundamental shift in how the enterprise world is betting on artificial intelligence.

From Safety Lab to Silicon Valley King

Anthropic was born in 2021 when Dario Amodei, Daniela Amodei, and a group of former OpenAI researchers walked out the door over concerns about the pace and safety of AI development. Their founding thesis — that AI should be built with constitutional principles baked in from day one — was considered idealistic by some, niche by others. Today, it looks prescient.

The company's rise has been nothing short of meteoric. In February 2026, Anthropic raised a $30 billion Series G, pushing its valuation to $380 billion. Just three months later, the Series H round more than doubled that figure. The speed of that climb is nearly unprecedented in venture capital history.

The Enterprise Play That Changed Everything

While OpenAI captured the world's imagination with ChatGPT's consumer appeal, Anthropic quietly built a different kind of machine — an enterprise-first revenue engine. The results speak for themselves: Anthropic's annualized revenue crossed $47 billion in May 2026, up from $14 billion as recently as February, compared to OpenAI's estimated $30 billion. Meanwhile, Anthropic reported its first-ever quarterly profit of $559 million in Q2 2026, while OpenAI projected a staggering $14 billion loss for the year.

Claude's dominance in the B2B space is hard to overstate. Anthropic now holds an estimated 54% of the enterprise coding market. Major consulting firms, including KPMG and PwC, have made sweeping commitments to Claude, with PwC alone deploying 30,000 certified professionals on the platform.

Who's Backing the Bet?

The Series H round attracted a marquee list of investors that reads like a who's who of global finance. Altimeter Capital, Dragoneer, Greenoaks, and Sequoia Capital co-led the round, joined by Capital Group, Blackstone, Brookfield Asset Management, Fidelity, General Catalyst, and Temasek, among many others. Notably, the round also included $15 billion previously committed by Amazon and other hyperscalers — a signal that cloud giants are doubling down on Anthropic as their preferred AI infrastructure partner.

Strategic backers like Samsung, Micron Technology, and SK Hynix also participated, underscoring that hardware and chip manufacturers are aligning themselves with Anthropic's long-term roadmap.

What This Means for the AI Race

OpenAI isn't going anywhere. With an $852 billion valuation and the world's most recognized AI brand, it remains one of the most powerful companies in tech. But the gap has closed — and in one key metric, it has been crossed. The real story here isn't a knockout blow; it's the emergence of a genuinely competitive AI duopoly, each with distinct strategic identities: OpenAI's consumer-facing reach versus Anthropic's enterprise depth and profitability discipline.

Both companies are now eyeing IPOs in the near future. When they hit public markets, investors will face a fascinating choice between two very different visions of what AI's commercial future looks like — and Anthropic, for the first time, arrives at that conversation as the one sitting at the top of the table.