Anthropic's quarter in the black lasted exactly one quarter.

The Claude maker filed an amended S-1 with the SEC on Monday, adding audited third-quarter results to the IPO prospectus it first made public on October 26 — and the numbers show a company growing at a pace almost nothing in tech history matches, yet still unable to keep up with what that growth costs.

Revenue hit $16.96 billion for the three months ended September 30 — up 1,127% from $1.38 billion a year earlier, up 47% from the second quarter, and over $33 billion for the first nine months of 2026. The business is also diversifying fast: about 79% of third-quarter revenue came from customers outside its top five, up from roughly 64% in the first quarter. No single customer accounted for more than 10% of revenue over nine months.

And yet Anthropic swung from a $974 million operating profit in Q2 to a $567 million operating loss. The reason, per the filing: demand ran so far ahead of the company's 12-to-18-month compute pipeline that it spent $5.0 billion on premium-priced short-term capacity, which Anthropic says "currently costs significantly more" than its long-term contracts. Compute and infrastructure ate 58 cents of every revenue dollar, up from 48 cents in Q2. A separate $2.0 billion non-cash charge from its employee donation-matching program added to the red ink. Anthropic warns the squeeze isn't over: "We expect our use of short-term compute to continue to increase in the near term and to in turn compress our operating margin."

The headline figure is the one the first filing left blank. Anthropic has now signed purchase commitments and leases totaling about $895.4 billion, "substantially all" of it for compute and infrastructure — roughly $447 billion of it due before the end of 2030. That nearly doubles the $518 billion figure that circulated from a leaked draft. Another $150–175 billion in potential deals, including more Google TPUs and a planned AMD purchase, sits outside the total because the dollar amounts aren't fixed yet, according to OfficeChai.

The non-GAAP picture is less dramatic — adjusted operating income actually rose to $2.5 billion from $2.2 billion, with the margin slipping to 15% from 19%. And $23.3 billion of the quarter's GAAP net loss was mostly non-cash marks on convertible notes as Anthropic's valuation climbed, not money going out the door. Operating cash flow was positive at roughly $7 billion for nine months, and September ended with about $147 billion in total liquidity.

But the roadshow story is now plain. The price range and share count are still blank, and with formal marketing expected to begin in the coming days, investors aren't just being asked to believe Claude keeps growing — they're being asked to underwrite nearly a trillion dollars of future compute before the infrastructure exists. The question that will decide the listing: whether Anthropic Direct, the company's own data center program, gets cheaper long-term capacity online fast enough to retire the short-term compute that's currently shredding its margins.

— via WebProNews