Ina FriedAdd Axios as your preferred source tosee more of our stories on Google.Illustration: Aïda Amer/Axios. Stock: Getty ImagesAnthropic is paying SpaceX $1.25 billion per month through May 2029 as part of the massive compute deal the companies signed earlier this month.Why it matters: It's a massive bill but comes as Anthropic's revenue is taking off and the company is hampered by a lack of compute power. It also is a significant boost to SpaceX, whose annual revenue is only around $18 billion per year.Driving the news: Anthropic and SpaceX announced their deal last month, but did not initially provide financial details. SpaceX announced the monthly payments as part of its filing for an initial public offering, released Wednesday. It said the payments would be reduced for May and June as the deal ramps up.Anthropic also announced moments before the filing became public that it was expanding beyond SpaceX's Colossus 1 facility to Colossus 2 as well."We're expanding our partnership with SpaceX, and will be scaling up on (Nvidia) GB200 capacity in Colossus 2 throughout June," Anthropic co-founder and chief compute officer Tom Brown said on X.SpaceX isn't done leasing out computing either. "We expect to enter into additional similar services contracts," it said in the filing. "We have sufficient capacity to provide compute for our own AI models, including support of our training and inference demands, and to satisfy the obligations under these agreements. "Yes, but: Either Anthropic or SpaceX can exit the deal with 90 days' notice, per the filing.