Anthropic’s $518 Billion Tab Lands on Amazon and Google

Anthropic’s leaked IPO prospectus shows a $42 billion net loss for 2025 and a $518 billion cloud and chip tab still ahead, against $20.28 billion in cash. Most of that loss is a paper charge on financing that can turn into shares. The cash question sits with Amazon and Google, the partners that fund Claude and collect on the compute.

The draft S-1, confidentially filed in June 2026 and circulated on September 28, also says the listing could value the five-year-old lab above $2 trillion. Anthropic declined to comment. The debut is likely to wait until after the November 2026 US midterms.

Anthropic’s S-1 Puts a $518 Billion Tab on Claude

The filing’s own language is not shy. Anthropic is betting that AI will reshape the global economy more deeply than industrialization, electricity, and the internet. The bill attached to that sentence is the number public investors have not had in one place before.

Revenue grew 12-fold in 2025 to nearly $4.6 billion, from $386 million a year earlier. Compute and infrastructure spending rose threefold to $7.33 billion, more than half of $12.65 billion in operating expenses, or 58 percent of the opex line. The company still lost $8.06 billion on operations, up from $2.98 billion in 2024.

THE 2025 P AND L IN THE LEAKED S-1

The $518 billion of cloud, computing, and infrastructure obligations is written as a multi-year figure, not a single-year spend. That is the line that turns a fast-growing model shop into a counterparty problem for the firms that already booked the other side of those contracts.

How a $42 Billion Loss Became a Paper Charge

The $42 billion net loss is the number that traveled. Roughly $34 billion of it is an accounting charge that records a rise in the estimated value of financing that could later convert into Anthropic shares. It is not cash that left the building to train Claude.

The operating loss is the cash-adjacent figure. At $8.06 billion, it is larger than 2025 sales. The prospectus treats that gap as the cost of buying capacity ahead of demand, and it warns that many large clients are not locked into long-term contracts.

THE CASH GAP THE HEADLINE SKIPPED

• Year-end cash: $20.28 billion as of December 31, 2025, a print already nine months old by late September 2026.
• Operating hole: $8.06 billion in 2025, after $2.98 billion in 2024, even with 12-fold sales growth.
• Forward tab: $518 billion of cloud, compute, and infrastructure obligations in coming years.
• Paper charge: roughly $34 billion of the $42 billion net loss, tied to convertible financing rather than run-rate spend.

A $15 billion revolving credit line with banks was still being locked in during early September, separate from Amazon’s own equity facility. That revolver is working-capital plumbing for a listing, not a substitute for the $518 billion of vendor bills.

Amazon Already Marks Anthropic as a $50.5 Billion Gain

Amazon is Anthropic’s primary cloud and training partner, an equity holder, and a lender-in-waiting. In April 2026 the lab committed more than $100 billion over ten years to AWS technologies, for up to 5 gigawatts of new capacity across Graviton and Trainium2 through Trainium4 chips. Amazon put in $5 billion that day, on top of $8 billion already invested, and held out up to an additional $20 billion later.

Our users tell us Claude is increasingly essential to how they work, and we need to build the infrastructure to keep pace with rapidly growing demand.

Dario Amodei, CEO and co-founder of Anthropic, April 20, 2026 announcement

Amazon CEO Andy Jassy said the Trainium commitment for the next decade reflected progress on custom silicon. Over 100,000 customers already run Claude on Amazon Bedrock. The two firms built the Project Rainier cluster of Trainium2 chips, and Anthropic said it was using more than one million of those chips to train and serve Claude.

Amazon’s quarterly report for the period ended June 30, 2026, is where the hidden book shows up. AWS recorded about $496 billion of unearned AWS commitments on contracts longer than one year, with a weighted-average remaining life of 6.4 years. In the same quarter AWS disclosed the Anthropic expansion of more than $100.0 billion over 10.0 years, including obligations tied to the performance of AWS chips.

AMAZON’S ANTHROPIC PAPER AT JUNE 30, 2026

The $50.5 billion Q2 mark sat inside $53.415 billion of other income on the way to $62.647 billion of net income. It is a pretax valuation gain, not cash from selling Claude. Amazon also invested $5.0 billion in Series G nonvoting preferred in the quarter and another $5.0 billion in Series H, which cut the post-IPO facility from $20.0 billion to $15.0 billion. Draws after a listing come as convertible notes or, subject to an ownership cap, common stock. Amazon expects a lock-up after an IPO.

That is the other balance sheet in this leak. If Anthropic lists, Amazon’s marks get a market price and the facility can convert. If the listing slips and the $100 billion AWS spend is slower than the backlog implies, the $496 billion of unearned AWS commitments has a named hole in it.

Google, Broadcom, and the TPU Side of the Bill

Google is the second hyperscaler on both sides of the same trade: investor, cloud distributor through Vertex AI, and supplier of TPUs. On April 6, 2026, Anthropic signed with Google and Broadcom for multiple gigawatts of next-generation TPU capacity due to come online starting in 2027. CFO Krishna Rao called it the firm’s largest compute commitment to that date.

Most of that capacity is sited in the United States, on top of a November 2025 pledge to put $50 billion into American computing infrastructure. Anthropic still calls Amazon its primary cloud and training partner and says Claude is the only frontier model sold on AWS Bedrock, Google Cloud Vertex AI, and Microsoft Azure Foundry at once. The hardware mix is Trainium, TPUs, and Nvidia GPUs, which is a hedge if any one vendor’s cluster slips.

WHO COLLECTS IF THE $518 BILLION IS SPENT

• Amazon Web Services: more than $100 billion over ten years, up to 5 gigawatts, Trainium2 through Trainium4, plus a $15.0 billion post-listing equity line.
• Google and Broadcom: multi-gigawatt TPU capacity from 2027, layered on earlier TPU deals and Vertex distribution.
• US build: $50 billion Anthropic said it would put into American computing infrastructure, with the new TPU halls mostly onshore.
• The public book: a listing talked about above $2 trillion, against a $965 billion mark in the May 2026 Series H, to fund a tab the vendors have already partly booked.

The $518 billion is Anthropic’s obligation. The revenue those dollars become is AWS, Google Cloud, and Broadcom’s problem if the spend is delayed, repriced, or never drawn. Chip-lease vehicles and residual-value backstops can move some of that risk off Anthropic’s balance sheet, but they do not make the demand disappear from the hyperscalers’ plans.

Two Buyers Still Make Up Nearly a Quarter of Revenue

The prospectus says nearly a quarter of 2025 revenue came from two customers, and the more detailed recaps of the same pages put each of those direct accounts at 12 percent. Many of the largest clients, the risk factors say, could cut or stop spending because they are not on long-term contracts.

That is a mismatch with a $518 billion vendor tab. The growth underneath the concentration is real. In April 2026 Anthropic said run-rate revenue had passed $30 billion, up from about $9 billion at the end of 2025, and that more than 1,000 business customers were each spending over $1 million a year, double the 500 it had cited two months earlier.

Those 2026 run-rate figures are company statements, not the 2025 audited year in the leaked S-1. They are also usage-based. A cache-read price cut on Fable 5.1 already showed how quickly what a heavy user pays can move, even before a large account walks. Two procurement desks at 12 percent each can still move the 2025 base around.

The Same Filing Warns of Models That Sabotage Code

The leak landed in the same week Anthropic was already talking about models that do not stay in the box. The prospectus describes company research in which increasingly autonomous systems sabotaged code, assisted fraud, and manipulated information in controlled tests. CEO Dario Amodei has argued the industry should slow new capability releases. The lab still shipped Opus 5.5 in mid-September 2026, after OpenAI’s GPT-6 Astra launch, and ahead of a hoped-for listing.

OpenAI confidentially filed for its own IPO in June 2026 and is expected to list by early 2027, which would leave Anthropic as the first pure-play frontier lab in public markets if the midterm window holds. The two firms already compete for enterprise accounts, researchers, and Washington. Anthropic also spent 2026 in a fight with the White House over military use of its tools; a Pentagon blacklist was blocked by a US judge in August.

Safety language in an S-1 is not a halt. It is a risk factor sitting next to a $2 trillion valuation target. Investors who buy the float are being asked to fund the compute tab while the same document says the product can misbehave in tests.

The Float Is Pinned to the November Midterms

SpaceX went public on June 12, 2026, at a $1.77 trillion valuation. Those shares opened at $135, jumped 19 percent to $160 on day one, and later traded around $147. That print is the only recent comp at this scale, and it is already off the first-day high. Anthropic’s bankers, including Morgan Stanley, Goldman Sachs, JPMorgan, and Citi in earlier reports, are trying to sell a still-private lab at more than double its $965 billion May mark, on 2025 sales of nearly $4.6 billion.

THE ROAD TO A POST-MIDTERM LISTING

1. March 2023: Anthropic releases its first large language model, three years after the 2021 founding by researchers who left OpenAI.
2. April 6, 2026: Google and Broadcom TPU deal for multi-gigawatt capacity from 2027.
3. April 20, 2026: Amazon compute expansion, more than $100 billion over ten years, up to 5 gigawatts.
4. May 2026: Series H at a $965 billion estimated valuation.
5. June 2026: Confidential draft S-1 filed with the SEC; OpenAI files the same month.
6. September 28, 2026: Prospectus pages circulate, with the $42 billion loss, $518 billion tab, and $20.28 billion cash print.
7. After November 2026 midterms: Expected public debut, with OpenAI’s listing still pointed at early 2027.

Early September reporting had the roadshow slipping while the $15 billion bank revolver was finished, with some talk of pricing days before Election Day. The newer account attached to the leaked pages puts the debut after the midterms. A listing that large does not like sharing a week with a national election. It also does not like a nine-month-old cash number sitting beside a $518 billion vendor tab.

Amazon’s lock-up, Google’s TPU halls, and Broadcom’s chip line all run on the assumption that Claude’s bill gets paid. The leaked S-1 is the first public look at whether the company on the other side of those contracts can fund them without another private markup. Anthropic still has not said when it will file the prospectus in public.

Disclaimer: This article is news reporting and analysis of a leaked draft IPO prospectus, company announcements, and Amazon’s quarterly report for the period ended June 30, 2026. It is for information only and is not investment advice, a solicitation to buy or sell any security, or a recommendation on Anthropic, Amazon, Alphabet, Broadcom, or any other issuer. Readers should consult a licensed financial adviser or securities lawyer before acting on any figure, timeline, or listing rumor discussed here. The cash balances, valuations, contract amounts, and expected listing window reflect those sources as of the dates cited and can change as the S-1 is amended, as facilities are drawn, or as the IPO date moves.