Anthropic's confidential IPO prospectus reveals a compute power leasing agreement with SpaceX, with a total cap of up to $84.5 billion and extending until 2029, Reuters reported on Tuesday. This figure is nearly double the previously disclosed approximately $45 billion, though most terms of the new agreement still retain a 90-day cancellation clause. Additionally, Anthropic anticipates total spending on AI infrastructure to reach at least $518 billion over the next decade, with partners including Google, Amazon, Microsoft, and SpaceX.