Anthropic's S-1 filing with the US Securities and Exchange Commission on October 26, 2026 opens the company's books for the first time: revenue for the first half of 2026 was $16.286 billion, against $1.163 billion in the same period last year, while the net loss for the period was $80.748 billion. Read together, the two numbers are easy to misread. What matters is what the loss is made of.
First, break down the $80.7 billion loss
The operating loss for the half was only $0.693 billion, a fraction of the net loss. Most of the gap comes from fair-value changes on convertible notes and similar instruments, about $72.388 billion: a revaluation on paper, not cash walking out the door in the period. 2025 shows the same pattern, with $4.585 billion of revenue and a $41.965 billion net loss. Reading only the net-loss line mistakes a valuation accounting effect for the speed at which the business burns cash.
Revenue up more than tenfold, costs up sharply too
Compute and infrastructure spending reached $8.945 billion in the half, up from $2.334 billion a year earlier, and personnel spending hit $3.152 billion. Growth comes from metered model usage and subscriptions, but the compute bill is a hard cost: the bigger the business gets, the harder that bill is to push down.
Nearly half of revenue passes through rivals' checkouts
About 48% of first-half revenue came through the cloud marketplaces of Google, Amazon and Microsoft, up from 11% in 2023. The filing describes the three simultaneously as investors, customers, distribution partners and competitors: they carry Claude to enterprise customers, yet each also owns or backs a rival model. Channel fees, placement and favoritism toward their own products feed straight into Anthropic's real margin.
Control and the compute bill are the second half of the story
A single share held by a vehicle connected to a co-founder carries 50.1% of general voting power, and a long-term benefit trust will elect a majority of the board. On compute, long-term commitments to Google, Amazon and Microsoft total roughly $450 billion, plus further arrangements such as chip leases. The share count and price range remain blank: the reported $100 billion raise and $2 trillion valuation are not in the filing and remain rumors until the roadshow. What investors are really waiting for is the amended filing that fills in the pricing.
