Anthropic's S-1/A puts its compute commitments at $895.4 billion; serving customers still takes about a quarter of the compute bill

Anthropic has filled in the blank. The amended registration statement it filed with the SEC on November 2, the S-1/A, puts the company's compute and infrastructure commitments at approximately $895.4 billion, "substantially all of which is related to compute and infrastructure". About $447.5 billion of that is expected to be incurred before the end of 2030, substantially all of the rest between 2031 and 2045, and approximately $69.8 billion falls due in the 12 months after September 30, 2026.

When we read the first S-1 a week ago, that sentence read "aggregate committed spend of more than $ ," with nothing after the dollar sign. The amendment also adds a third quarter of financials, which lets us update the other number from that post: how much of Anthropic's compute bill actually goes to serving paying customers.

The third quarter

Anthropic says revenue for the three months to September 30 was $17.0 billion (the quarterly table gives $16,956 million), up 1,127% year over year, while compute and infrastructure expenses grew 382%. In the first filing the comparable figures for the second quarter were 1,368% and 300%. Revenue is still growing much faster than the compute bill, but the gap narrowed.

The supplemental table that groups expenses by function now covers nine months instead of six. Subtracting the first half from the nine-month totals gives the third quarter on its own:

The subtractions and percentages are ours. As before, the share overstates serving, because cost of revenue also carries some personnel and overhead costs. So in the third quarter, at most about a quarter of a nearly $10 billion compute bill went to customer-serving workloads. The footnotes still say research and development "primarily" consists of compute for model development, research and internal usage, and that free access to Claude is booked under sales and marketing. Serving paying customers cost about 14% of revenue in the quarter.

The filing also gives a clue to how big the internal slice has become. It says the value of Anthropic's own Claude usage at list prices grew more than 250 times between January and September 2026, and that in April this monthly value first exceeded the company's monthly personnel expense, excluding stock-based compensation. That is a list-price valuation, not what the compute cost Anthropic, but it fits the picture of an R&D line that is now almost as large as the whole compute bill.

On profit, the quarterly table shows an operating loss of $567 million for the third quarter after an operating profit of $974 million in the second. The swing comes from a $1.96 billion non-cash charge for charitable contributions in the quarter; on Anthropic's adjusted measure, which removes it and stock-based compensation, operating income rose from $2.2 billion to $2.5 billion.

What $895 billion means

The headline number is not one kind of obligation. It covers "purchase commitments and lease agreements, including short-term commitments, as well as leases not yet commenced", signed as of and after September 30. The notes to the financial statements give a narrower figure: expected future fixed or minimum guaranteed commitments under its cloud and infrastructure agreements of approximately $313.8 billion as of September 30, with terms of one to 20 years. At the end of 2025, the same note listed $54.6 billion of non-cancelable purchase commitments. The company also says it has compute agreements with no fixed dollar commitment, which are not included in that figure, and whose payments "are expected to be significant".

Two comparisons put the near-term part in proportion. The $69.8 billion due in the next 12 months is roughly 1.8 times the third-quarter compute expense annualized ($9.86 billion times four, about $39.5 billion), so the compute bill is set to keep climbing steeply. It is also about the size of third-quarter revenue annualized, around $68 billion. Payments due and expenses recognized are not the same thing, and the filing says compute is recognized as capacity is delivered, so these are orders of magnitude rather than a forecast. They do show what the business has to grow into: next year's committed compute alone is about as large as this quarter's revenue run rate.

The first S-1 told us the commitments ran for two decades. The amendment says they are worth nearly $900 billion, about half of it before 2031. The offering price range on the cover is still blank.