Anthropic Passes OpenAI After a $965 Billion Chip-Backed Round

Anthropic closed a $65 billion Series H on May 28, 2026, at a $965 billion post-money value, above OpenAI’s last private mark. The Claude maker said run-rate revenue crossed $47 billion earlier that month. Micron, Samsung, and SK hynix joined as infrastructure partners, and Amazon’s already pledged $5 billion sat inside the total.

The new owners are the firms that sell the memory and the racks Claude runs on. The round finances the shortage those firms still have to fill.

A $65 Billion Round With $15 Billion Already In

Anthropic raised $65 billion in Series H funding led by Altimeter Capital, Dragoneer, Greenoaks, and Sequoia Capital. Capital Group, Coatue, D1 Capital Partners, GIC, ICONIQ, and XN co-led. The $65 billion includes $15 billion of previously committed hyperscaler money, of which $5 billion is Amazon’s, which leaves $50 billion of new cash in the envelope.

The February Series G had valued the company at $380 billion. The May price more than doubled that mark in three months. Krishna Rao, Anthropic’s chief financial officer, tied the raise to demand the company said it was still racing to serve.

Claude is increasingly indispensable to our growing global community of customers, and we work tirelessly to make tools like Claude Code and Cowork more helpful, more powerful, and more adaptable to their needs. This funding will help us serve the historic demand we are experiencing, stay at the research frontier, and bring Claude to more of the places where work happens.

Krishna Rao, Chief Financial Officer, Anthropic

Brad Gerstner, founder and chief executive of Altimeter Capital, said Claude’s latest gains had driven adoption at “the world’s most demanding organizations.” Sequoia partner Alfred Lin said startups and Global 5000 companies were putting Claude on complex workflows. The same day, Anthropic put out Claude Opus 4.8, a new Opus-class model aimed at coding and agent work.

THE ROAD TO THE MAY CLOSE

1. February 2026: Series G values Anthropic at $380 billion after the prior private round.
2. April 20, 2026: Amazon agrees to invest up to $25 billion, and Anthropic pledges more than $100 billion of AWS spend over 10 years.
3. May 6, 2026: Anthropic raises paid Claude Code caps and books all of SpaceX’s Colossus 1 compute.
4. May 28, 2026: Series H closes at $65 billion and a $965 billion post-money value.

Proceeds, the company said, go to safety and interpretability research, more compute for Claude, and the products customers already run. That is a capacity budget first, a trophy second.

Memory Chipmakers Took Equity in Their Own Customer

Anthropic named Micron, Samsung, and SK hynix as strategic infrastructure partners in the round, and said their technologies sit at the center of the world’s supply of memory, storage, and logic chips. Those three firms are the ones that make high-bandwidth memory at scale, the stacked DRAM that keeps an accelerator fed. Without that stack, a training rack waits on data.

HBM for 2026 is already spoken for at the suppliers. SK hynix, Samsung, and Micron have told investors that this year’s output is sold. Putting them on the cap table does not mint new wafers next quarter. It gives the customer a seat with the only three shops that can ship the parts, which is the point of writing the check this way.

A widely shared comparison after the close put Anthropic above Samsung on value while using a $7 billion revenue line that is not the figure Anthropic disclosed. The $47 billion run-rate in the May post is the number that belongs next to $965 billion. Chip vendors taking stock in the lab that buys their HBM is the cleaner read, and it is the same loop GPU makers are now being asked to close if they anchor a later listing.

Anthropic also said the new ties would help it scale compute “at the pace our customers need.” That sentence is a supply contract in equity clothing. The memory makers are not decorating a venture tombstone. They are underwriting a buyer whose models eat HBM as fast as the fabs can pack it.

Amazon’s Cloud Bill Runs Past $100 Billion

On April 20, 2026, Amazon said it would invest up to $25 billion in Anthropic, $5 billion immediately and up to $20 billion more if commercial milestones are hit, on top of $8 billion it had already put in. Anthropic, in turn, committed to spend more than $100 billion on Amazon cloud technology over the next 10 years and to keep using Amazon’s Trainium chips, including future generations. Dario Amodei, Anthropic’s chief executive, said users called Claude essential to how they work and that the company had to build infrastructure to keep up. Andy Jassy, Amazon’s chief executive, said Anthropic’s choice to run on Trainium “reflects the progress we’ve made together on custom silicon.”

The $5 billion already inside Series H is that April cash, not a second Amazon cheque. AWS remains Anthropic’s primary cloud and training partner, and Claude is on Amazon Web Services, Google Cloud, and Microsoft Azure, the first frontier model the company says is live on all three large clouds.

COMPUTE BOOKED ALONGSIDE THE ROUND

Series H also cites GPU access at Colossus 2. Anthropic said it had “expressed interest” in orbital compute with SpaceX, which is a wish list item, not a live rack. The live problem is still earthbound: power, memory, and the months between a gigawatt on paper and a gigawatt that answers a Claude request.

The OpenAI Multiple Is Still the Steeper One

OpenAI’s last private round, closed March 31, 2026, set an $852 billion post-money valuation on $122 billion of committed capital, anchored by Amazon, NVIDIA, and SoftBank, with Microsoft staying in. OpenAI said it was generating $2 billion of revenue a month at that close, which annualizes to $24 billion, and that ChatGPT had more than 900 million weekly active users and over 50 million subscribers. It also took in more than $3 billion from individuals through bank channels.

Anthropic disclosed no weekly user count in the Series H post. It disclosed a run-rate. The two labs were already in a revenue race ahead of dual IPOs before this round closed, and the May print flipped the private-value order without flipping who had raised more cash.

LAST PRIVATE MARKS, SIDE BY SIDE

OpenAI said enterprise was already more than 40 percent of its revenue and on track to match consumer by the end of 2026. Anthropic’s mix, as described by the company and by people who sell against it, sits much heavier on metered API and coding work. Claude Code is a seat-and-token product. ChatGPT is a front door with a subscriber base OpenAI puts at over 50 million. Those are different machines that now share a buyer inside large companies, which is why the private marks moved so fast and why a public filing will have to show cost of revenue, not just run-rate.

Peak Throttling Came Off Three Weeks Early

On May 6, 2026, three weeks before Series H, Anthropic said a SpaceX deal plus other compute contracts had let it raise paid usage caps. It doubled Claude Code five-hour rate limits and took the peak-hour haircut off the plans that hit it hardest. Weekly caps did not move.

THE MAY 6 CAP CHANGES

• Five-hour window: Claude Code limits doubled for Pro, Max, Team, and seat-based Enterprise plans.
• Peak hours: The limit reduction on Claude Code was removed for Pro and Max accounts.
• Opus API: Per-minute and per-day rate limits on Claude Opus models were raised, with weekly subscription caps left in place.

The company had already spent March pushing extra off-peak quota, then clipping Pro and Max during the workday, a load-balancing trick familiar from cloud billing. The May 6 note was the first lasting relief on the five-hour clock. Even so, people who watch Claude’s meters still saw weekly caps bind, and at the May 28 close Anthropic was still describing demand it could not fully serve at the busiest hours. Extra quota is not the same as spare clusters.

Colossus 1 was the near-term patch: more than 300 megawatts and over 220,000 NVIDIA GPUs, aimed at Pro and Max. The 5 gigawatt Amazon block and the 5 gigawatt TPU block sit further out. That gap is why a lab with a $965 billion sticker still talks like a company buying time.

June’s Confidential S-1 Leaves the Price Blank

On June 1, 2026, Anthropic, PBC said it had confidentially submitted a draft Form S-1 to the U.S. Securities and Exchange Commission for a proposed initial public offering of common stock. The company said that filing gives it the option to go public after the SEC finishes review, and that any offering will depend on market conditions and other factors. It has not set a share count or a price. As of early September 2026, no public Anthropic S-1 sat in the SEC’s public archive.

WHAT WE KNOW

• The private mark: Series H closed May 28, 2026, at $65 billion and $965 billion post-money.
• The filing: A confidential draft S-1 went to the SEC on June 1, 2026, with no price and no share count.
• The rival mark: OpenAI’s last published private round is $122 billion at $852 billion, closed March 31, 2026.

WHAT IS UNCONFIRMED

• Listing size: Talk of a raise as large as $100 billion, and of a public value near $2 trillion, has not come from Anthropic.
• Anchor cheque: People briefed on talks have described NVIDIA considering up to $10 billion in an offering; the company has not announced it.
• Calendar: Roadshow chatter pointing at mid-October 2026, and a revolving line near $15 billion, remains outside the June 1 notice.

If a chip vendor does buy stock in a listing, that would extend the same pattern Series H already set: the people who sell the parts take paper in the customer. Until a public prospectus lands, the $965 billion figure is still a private mark, and the share count is still blank.

The owners who matter for the next training run are already on the list. Memory makers, Amazon, and the other rack vendors took equity while Claude’s meters still click to zero. The S-1 can wait on the market. The HBM cannot.