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People familiar with the matter said Anthropic is SpaceX's (SPCX.O) largest single customer, contributing more than one-third of the company's revenue in the third quarter of 2026. A filing submitted by SpaceX last week showed that about 34.5% of revenue in the previous quarter came from a customer that purchased computing power for its AI division, and people familiar with the matter confirmed that the customer is Anthropic. Anthropic previously signed a computing power contract with SpaceX, with total spending under the contract of up to $120.5 billion, running through 2029, and average monthly spending of about $3.1 billion expected from December 2026. However, Anthropic may cancel the relevant contract with 90 days' notice after January and March 2027, respectively. The report noted that SpaceX's revenue dependence on Anthropic highlights the customer concentration risk in its AI computing power business; at the same time, the AI computing power leasing industry is facing pressure from tightening financing. Another major customer of SpaceX in the third quarter was a relevant government agency, contributing 16.6% of revenue, while the U.S. federal government had previously been its largest single customer.