Anthropic Hits $965 Billion Valuation, Edges Past OpenAI

Anthropic closed a $65 billion Series H on May 28 at a $965 billion post-money valuation, a 154% step-up from the $380 billion mark it set in February and a number that pushes the Claude maker past OpenAI’s $852 billion close from March. The round was led by Altimeter Capital, Dragoneer, Greenoaks and Sequoia Capital, with co-leads Capital Group, Coatue, D1 Capital Partners, GIC, ICONIQ and XN.

The headline is the league-table swap. The structure of the round is the more interesting read: $15 billion of the $65 billion is previously committed hyperscaler money already flowing in, infrastructure suppliers Micron, Samsung and SK hynix joined the equity side, and the proceeds map directly to a compute shortage Anthropic has been rationing through usage limits since March.

The Numbers Behind the Series H Close

Anthropic confirmed the round in its own May 28 announcement, listing four lead investors and six co-leads alongside more than a dozen significant participants including Baillie Gifford, Blackstone, Brookfield, Fidelity Management & Research, Insight Partners, Jane Street, T. Rowe Price and Temasek. The mix skews unusually heavy on public-market crossover funds, which is what a pre-IPO book looks like when bankers want orderly cornerstones already on the cap table.

The Series H stack:

• $65 billion raised at a $965 billion post-money valuation, the largest pre-IPO equity round disclosed by an AI lab.
• $47 billion run-rate revenue crossed earlier in May, against $14 billion at the Series G close on February 12.
• $15 billion of the $65 billion is previously committed money from hyperscaler partners, including $5 billion from Amazon under its expanded April pledge of up to $25 billion.
• 105 days between Series G and Series H, with the valuation rising roughly $5.6 billion per day across that gap.

Krishna Rao, Anthropic’s chief financial officer, said the new capital is earmarked for safety and interpretability research, compute expansion, and scaling Claude Code and the Cowork agent product. “This funding will help us serve historic demand, stay at the research frontier, and bring Claude to more places,” Rao said in the company’s announcement.

Why the Round Closed in May, Not October

The simpler timing story is that Anthropic could not wait. Claude has been hitting capacity walls for two months. In late March, the company tightened weekly usage limits for paid plans during U.S. weekday peak hours, an unusual move for a frontier lab and one that pushed power users toward Google Gemini and OpenAI’s o-series for off-hours workloads.

The strain has a single root cause. Enterprise demand outran the compute pipeline Anthropic provisioned when revenue was a tenth of what it is now. Run-rate revenue tripled between February and May, jumping from $14 billion to $47 billion, while the lead time on new H200-class capacity from any hyperscaler is roughly 12 to 24 months. The math does not close.

The company has been buying capacity wherever it can find it. On May 6, Anthropic announced a deal with SpaceX for the full output of the Colossus 1 data center, more than 300 megawatts and roughly 220,000 GPUs, and used that capacity to double Claude Code’s five-hour rate limits for Pro, Max, Team and Enterprise plans. The new $65 billion gives finance the room to pre-pay for the next two years of similar deals rather than wait on a public listing.

Series G to Series H in 105 Days

The cleanest way to read the speed of the rerating is to put the two rounds side by side. The February financing was already a record at the time. The May round broke that record by a wider margin than most observers expected.

The multiple compression is the part Anthropic’s bankers will want to highlight. Despite a 154% jump in valuation, the revenue multiple actually dropped from 27.1 times run-rate at Series G to 20.5 times at Series H, because revenue grew faster than the price tag. That is the sentence that gets read into the IPO prospectus.

The lead-investor swap also reads as a deliberate handoff. GIC and Coatue, both crossover funds comfortable holding into a listing, anchored Series G. Sequoia returning as a Series H co-lead, after sitting out the run from Series E onwards, is the bigger signal: the firm is back in size at a 2.5x markup from where it last bought.

The Hyperscaler and Infrastructure Lineup

The investor list reveals a structural shift in how frontier labs are being financed. The Series H names every major U.S. and Asian hyperscaler on the equity side, and for the first time pulls memory and chip suppliers directly into the cap table.

The hyperscaler block:

• Amazon contributed $5 billion of an up-to-$25 billion April commitment, on top of $8 billion previously invested, with Anthropic committing to spend more than $100 billion on Amazon Web Services compute over the next decade.
• Google participated, extending a relationship that already includes TPU access and a multi-year cloud deal.
• Microsoft appeared on the cap table for the first time, a notable break given its prior exclusivity tilt toward OpenAI.

The infrastructure block is the new wrinkle. Micron, Samsung and SK hynix, the three companies that supply roughly all of the high-bandwidth memory used in AI accelerators, joined the round as strategic investors. That is partly a hedge against the customer concentration risk those firms run with a handful of GPU buyers, and partly a way to lock in priority allocation for an Anthropic customer increasingly competing with hyperscalers for HBM3E supply.

Sibling coverage on Anthropic’s recent model line, including the Claude Opus 4.8 release earlier this month, gives some sense of why enterprise spend keeps compounding through the year despite the rationing.

OpenAI’s $852 Billion Still Looks Bigger on the Revenue Math

The valuation gap is real but narrower on a revenue-adjusted basis than the league table suggests. OpenAI closed a $122 billion round at $852 billion on March 31, led by SoftBank and including a $50 billion Amazon commitment and $30 billion contributions from each of Nvidia and SoftBank. OpenAI’s March disclosure pegged monthly revenue at $2 billion, implying a $24 billion annual run-rate at that round.

The comparable revenue-multiple read:

OpenAI at $852 billion on $24 billion run-rate trades at 35.5 times revenue. Anthropic at $965 billion on $47 billion run-rate trades at 20.5 times. The Claude maker is cheaper per dollar of revenue, which is unusual when the league-table number says the opposite.

Two months of revenue growth at either company would close most of that gap, so the league-table position is genuinely fluid. What is harder to move is the customer-mix difference. Anthropic skews enterprise: more than 1,000 customers spending above $1 million annually as of April, doubled from 500-plus in February. OpenAI’s revenue base still leans on ChatGPT subscriptions and a much larger consumer tail, which carries lower gross margins.

Two IPOs Heading for the Same Window

The Series H closes one private financing question and opens a much larger public one. Both Anthropic and OpenAI have told bankers and major LPs they are preparing public listings, with Anthropic widely targeted for October. The market cannot easily absorb two AI listings at this scale in a single quarter.

The mechanics are tight. A $965 billion private mark implies a first-day market capitalization band of roughly $900 billion to $1.1 trillion, depending on listing-day discount and how much float the cornerstones sell. That is a Saudi Aramco-scale debut, and it would need to clear in a quarter when OpenAI may also be filing. The crossover funds Anthropic just added, Fidelity, T. Rowe Price, Baillie Gifford, Blackstone, are exactly the books that would anchor that IPO, which is why their inclusion at Series H matters more than the headline value.

The risk is the cycle. AI capex commitments across hyperscalers now exceed $400 billion annualized, and the gap between training-cluster spend and observable enterprise software revenue keeps widening. If macro conditions tighten between now and Q4, Anthropic’s window narrows and the $965 billion mark becomes the high-water reference price for a smaller listing. If demand holds, the Series H valuation looks conservative by autumn. The cornerstone book is betting on the second outcome, but it bought the first option in case the floor moves.

The next visible test is the Q2 revenue print, which will land into the IPO marketing window. Anthropic told a CNBC reporter on May 20 that internal forecasts put Q2 revenue at $10.9 billion, which would mark the company’s first operating-profitable quarter. If that print arrives clean, the path from $965 billion to a trillion-dollar listing is plausible. If it slips, the same names that just bought in get to defend the mark.