
Anthropic’s third quarter brought in almost $17 billion in revenue and still ended with an operating loss. In an amended IPO prospectus filed with the Securities and Exchange Commission this morning, the Claude maker put most of the swing on $5.0 billion of short-term compute, which costs it more than capacity bought under long-term contracts, and $2.0 billion in non-cash charges from its employee donation matching program.
Revenue for the three months ended Sept. 30 was $16.96 billion. That compares with $1.38 billion a year earlier and $11.56 billion in the second quarter. The operating line went the other way: a $567 million loss, after $974 million of operating income in the June quarter, the only quarter with operating income in the filing’s quarterly table. The original S-1, which WebProNews covered last week, stopped at June 30. Figures shared with prospective investors in mid-October had put the quarter at $16.8 billion.
Paying up for capacity it couldn’t wait for
Compute and infrastructure expenses reached $9.86 billion, or 58% of revenue, up from 48% in the second quarter. Anthropic says it usually contracts compute 12 to 18 months before the capacity shows up. When customer demand or research needs run past that pipeline, it buys short-term capacity at a higher price, and the filing says that will keep growing for now: “We expect our use of short-term compute to continue to increase in the near term and to in turn compress our operating margin and Adjusted Operating Margin as a result.”
The non-GAAP view held up better. Adjusted operating income rose to $2.5 billion from $2.2 billion in the second quarter, though the adjusted margin slipped to 15% from 19%. Price cuts on new model versions, along with contractual discounts, offset about $600 million of usage-driven revenue gains between the two quarters. The only other quarter-to-quarter change where the filing puts a number on price cuts came at the end of 2025, at about $70 million.
Most of the net loss had nothing to do with running the business. Anthropic lost $23.3 billion in the quarter, compared with $12.1 billion a year earlier, and $21.9 billion of that came from marking convertible notes and similar instruments to a higher company valuation. Total operating expenses were $17.5 billion, up 292% from the third quarter of 2025.
Fewer eggs in the top five baskets
About 79% of third-quarter revenue came from customers outside the five largest, up from roughly 64% in the first quarter. The top five still made up about 25% of revenue over nine months, and each of them spent a record amount in the third quarter. Sales through cloud provider marketplaces accounted for 44% of nine-month revenue, below the 48% the first filing showed for the half. Sales, marketing and partnership costs fell to 14% of revenue from 22% in the first quarter, which the company tied partly to new terms in its channel partner deals.
The bigger number sits in the commitments section, which the first filing left blank. Anthropic has signed purchase and lease agreements worth about $895.4 billion, substantially all of it for compute and infrastructure, the amendment shows. About $69.8 billion falls due within 12 months of Sept. 30 and roughly $447.5 billion before the end of 2030. A growing share runs through Anthropic Direct, its program for leasing chips and hosting them in dedicated facilities, which it says will let it backfill expensive short-term capacity with cheaper long-term compute as its own infrastructure comes online. It ended September with $146.6 billion of liquidity, including $95.6 billion in cash and $36.3 billion in short-term investments.
The amendment still leaves the price range and share count empty. The line for run-rate revenue as of Oct. 31 is blank too.
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