Anthropic's S-1/A shows $895B in compute commitments

Anthropic's growth is slowing. Its bills are not.

Anthropic filed an amended S-1 with the SEC on November 2, adding third-quarter results to the IPO prospectus it filed in late October. Revenue was $17.0 billion for the three months ended September 30. The bigger number sits a few pages later.

$895.4 billion.

That is Anthropic's aggregate committed spend on purchase commitments and leases as of and after September 30, "substantially all of which is related to compute and infrastructure," according to the filing.

Revenue still climbs, but the curve bent

The filing's quarterly table shows revenue of $4.73 billion in the first quarter of 2026, $11.56 billion in the second and $16.96 billion in the third.

That third-quarter step is about 47%. The second-quarter step was about 144%.

Year over year, third-quarter revenue grew 1,127%, Anthropic says. Revenue for the first nine months was $33.2 billion. The filing is blunt about what comes next: "We do not expect our revenue will continue to grow at comparable rates, and we cannot assure you that it will continue to grow at all."

Costs went the other way. Compute and infrastructure expense rose to $9.86 billion in the third quarter from $5.56 billion in the second. As a share of revenue, it went from 48% to 58%.

So Anthropic swung to a $567 million operating loss in the third quarter, after $974 million of operating income in the second. The net loss was $23.3 billion, most of it a $21.9 billion change in the fair value of convertible notes and related instruments. That is an accounting charge, not cash out the door.

The commitments are the story

Yes, $17 billion in a quarter is a lot of revenue. Put it next to the commitments.

The filing says about $447.5 billion of the total is expected to be incurred before the end of 2030, and substantially all of the rest between 2031 and 2045. About $69.8 billion falls due in the 12 months after September 30.

Those contracts include minimum purchase commitments and take-or-pay terms that, in the filing's words, "obligate us to pay for resources regardless of actual utilization." Anthropic says it runs across AWS Trainium, Google TPUs, Nvidia GPUs and AMD GPUs.

Anthropic has pre-bought years of compute on the bet that demand keeps climbing. At 47% a quarter, that bet looks fine. If growth keeps slowing, the fixed bill does not shrink with it.

What it means if you build on Claude

Your vendor's margins shape your price and your limits. Compute already takes a bigger slice of each revenue dollar than it did in the spring. When a supplier's costs run ahead of its revenue, the usual levers are price, rate limits and which customers get capacity first.

Nothing in the filing announces a price change. It does show you where the pressure sits.

Two moves are worth making this week. Track what each of your Claude tasks costs today, so you can see a change the day it lands. And keep a second provider tested on your core workflows, through an AI gateway or your own model routing, so a change in limits means a config edit and an afternoon of checks.

What to watch

The roadshow comes first. CNBC reports Anthropic is preparing to start it, and the price range will show how investors weigh the growth against the commitments.

Then the fourth quarter. Another step down in growth would make the $69.8 billion due this year the number everyone quotes.

Watch the growth rate, not the revenue. Then watch your rate limits.