Anthropic accounted for more than a third of SpaceX's revenue in the third quarter, emerging as the space company's largest single customer ahead of the U.S. federal government, Bloomberg News reported on Thursday. The report, which cited a person familiar with the matter, identified the previously anonymous client described in a SpaceX filing only as "Customer B."

The customer contributed 34.5% of SpaceX's revenue for the quarter. The figures confirm that Customer B is Anthropic, meaning the AI company's payments now exceed those of the U.S. federal government, which had previously been SpaceX's largest single customer, and mark the first time the startup has overtaken NASA and the Pentagon.

News of the disclosure spread on X, where Andrew Curran wrote:

Customer B has been revealed. Anthropic is SpaceX's largest single customer, overtaking NASA and the Pentagon for the first time. 34.5% of SpaceX's revenue last quarter was from compute-as-a-service to Dario Amodei, and Anthropic has committed to spending up to $120.5 billion… pic.twitter.com/rWdVby9SSX

— Andrew Curran (@AndrewCurran_) October 29, 2026 (via X)

The revenue was generated through compute-as-a-service agreements in which SpaceX supplies Anthropic — the San Francisco-based AI company behind the Claude chatbot, led by Chief Executive Officer Dario Amodei — with dedicated computing capacity. For SpaceX, the agreements show AI compute demand emerging as a revenue pillar alongside — and now, by customer share, ahead of — its government work.

Details of the computing contracts

Anthropic has agreed to spend as much as $120.5 billion on computing contracts with SpaceX, with the deals running through 2029, according to Anthropic's initial public offering disclosures. That works out to about $3.1 billion per month, with payments set to begin in December of this year.

The agreements cover computing capacity at SpaceX data centers in Memphis, Tennessee. SpaceX, formally Space Exploration Technologies Corp., is the aerospace company founded by Elon Musk.

The contracts also include a cancellation option. Beginning in early 2027, Anthropic can end the agreements with 90 days' notice, Bloomberg reported. The schedule sets up clear markers to watch: monthly payments begin in December, and the exit window opens in early 2027, ahead of Anthropic's planned public listing.

SpaceX's AI business and customer mix

SpaceX's AI business turned profitable for the first time in the latest quarter. Bloomberg said the milestone helped support Musk's target of $100 billion in annualized revenue by the end of 2026.

SpaceX shares were down 0.92% at the time of the Investing.com report, which noted that the figures show the company's growing reliance on AI computing contracts.

Anthropic filed an IPO prospectus this week, ahead of its planned public listing. It showed that almost half of Anthropic's revenue comes from Amazon, Google and Microsoft. The filing places Anthropic at the center of the AI industry's concentration debate — a company drawing its revenue heavily from three large cloud customers while directing its own multi-year compute spending to a single supplier.

Investors have raised concerns that the AI industry relies on a small number of firms. They say a failure at one company could raise the risk of market instability.

Bridgewater addressed the issue in a note to clients. "Concentration and acceleration are also risky in their own right," the firm said. The note added that "more plain luck is needed to keep economies chugging."

As of Friday, Anthropic is SpaceX's biggest customer, accounting for about a third of the company's sales last quarter.

Source: CoinCentral