Anthropic's $15 billion-a-year SpaceX compute deal can end on 90 days' notice from either side
Anthropic pays SpaceX $1.25 billion a month for compute through May 2029 on terms either side can end with 90 days' notice. That notice period covers about $3.75 billion of the roughly $45 billion the contract is worth if it runs to term.
The Investor · Invest desk
What happened
- The contract gives Anthropic the full 300-megawatt output of Colossus 1, a data center near Memphis with more than 220,000 Nvidia GPUs, owned by Musk's xAI.
- Musk, who posted in September 2025 that "Winning was never in the set of possible outcomes for Anthropic," said in July he had been "clearly wrong about Anthropic."
- Anthropic's confidential IPO prospectus commits it to at least $518 billion of compute over 10 years across six partners, among them Google, Amazon, Microsoft, Broadcom and xAI.
- Google has signed its own compute deal with SpaceX, worth $920 million a month through June 2029.
Why it matters
- What it limits constraint While all 300 megawatts of Colossus 1 go to Anthropic, xAI cannot use its own Memphis data center to train or run its own models.
- What it sets up precedent The Anthropic and Google contracts together run at about $26 billion a year, above the $18 billion total revenue cited for SpaceX, so other labs can expect SpaceX to keep renting capacity to xAI's competitors.
- What doesn't add up contradiction Cryptopolitan's headline calls this an $84.5 billion deal while its FAQ cites TechCrunch at about $40 billion, so the contract's total size is unsettled and only the monthly rate is stated consistently.
Fifteen billion dollars a year [3] for the 300 megawatts of Colossus 1 [6] works out to $50 million per megawatt-year [28]. Spread across more than 220,000 GPUs, it is at most about $68,000 per GPU a year, or near $7.80 an hour [29], if the monthly payment covers Colossus 1 alone. It may not. "We're expanding our partnership with SpaceX, and will be scaling up on (Nvidia) GB200 capacity in Colossus 2 throughout June," Tom Brown, Anthropic's co-founder and chief compute officer, wrote on X [12].
Cryptopolitan puts SpaceX's total annual revenue near $18 billion [4], and Anthropic's $15 billion is about 83% of that [22]. Anthropic ranked among SpaceX's largest customers as of July [11]. Musk said abruptly cutting off a paying customer was "not my style" [15]. As evidence, he cited Tesla's 2014 decision to stop suing over its patents and the opening of its Supercharger network to other carmakers [16].
Anthropic's prospectus sets a floor of $518 billion over 10 years [8], and some of those commitments must be paid whatever it uses [9]. Spread evenly, the floor is $51.8 billion a year [24], and the SpaceX run rate is about 29% of it [25]. Claude already trains and runs on AWS Trainium, Google TPUs and Nvidia chips [18]. The company says it will build its own infrastructure so it depends less on partners that run their own labs [17]. Meanwhile it is using the SpaceX capacity now: it doubled five-hour Claude Code limits on Pro, Max, Team and enterprise seat plans, dropped peak-hour throttling for Pro and Max, and raised API limits for Opus [19].
The exit clause can play out three ways. If Anthropic's own capacity arrives before May 2029, a quarter's notice lets it step off SpaceX hardware without paying for idle racks through the full term [1]. If its build runs late, the same clause lets the company that owns a rival lab, xAI having merged into SpaceX in February [7], end supply with 90 days' warning. The third path belongs to SpaceX: if it keeps signing labs, it can reprice Anthropic's capacity at renewal.
I think the option sits with Anthropic. A seller whose single customer pays the equivalent of about 83% of its stated revenue [22] has little reason to give notice, while Anthropic can leave once its own racks are ready [17]. The counter-case is that Anthropic has tied user limits to this capacity [19] and cannot leave until a replacement is running. Before its own build is done, the option is worth little. Cryptopolitan does not report whether leaving early costs anything beyond the notice period; if it does, this view is wrong, as it is if SpaceX can refill Colossus 1 within a quarter.
What to watch
- An updated SpaceX revenue figure showing whether the roughly $18 billion total already includes the Anthropic payments.
- A public version of Anthropic's prospectus showing how much of the $518 billion floor sits with xAI and which commitments are payable regardless of usage.
- Whether Anthropic's stated interest in multiple gigawatts of orbital compute with SpaceX becomes a signed contract running past May 2029.
Information, not investment advice. This story is general information about companies and markets, drawn from cited reporting. It is not a recommendation to buy, sell or hold any security; check the cited sources before acting.
Clarity's read
What the record supports and how the coverage leans. The claims behind it follow.
Reality
- Evidence60
- Adoption72
- Hype gap+30
- Incentives65
- Confidence58
Perspective Coverage
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Claim ledger
Ranked by verification strength, evidence, and original report placement.
- [1]
Either side can walk away from the Anthropic-SpaceX partnership on 90 days' notice.
- [2]
A SpaceX regulatory filing from May showed Anthropic paying SpaceX $1.25 billion every month for compute capacity, in a deal that runs through May 2029.
- [3]
The Anthropic-SpaceX deal is a run rate of $15 billion a year.
- [4]
SpaceX's total annual revenue sits near $18 billion.
- [5]
Google signed its own SpaceX compute deal worth $920 million a month through June 2029.
- [6]
The arrangement gives Anthropic the entire 300-megawatt output of Colossus 1, a data center near Memphis, Tennessee, with more than 220,000 Nvidia GPUs.
- [7]
Musk's xAI, which merged with SpaceX in February, owns Colossus 1.
- [8]
In a confidential IPO prospectus, Anthropic disclosed it expects to spend a minimum of $518 billion over 10 years across six partners, including Google, Amazon, Microsoft, Broadcom and xAI.
- [9]
Anthropic stated it is locked in to some commitments that it has to pay regardless of usage.
- [10]
Cryptopolitan describes Google's SpaceX deal as a sign the company plans to keep leasing capacity to rival AI labs.
- [11]
Anthropic ranked among SpaceX's largest customers as of July.
- [12]
"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 wrote on X.
- [13]
In September 2025 Musk posted on X: "Winning was never in the set of possible outcomes for Anthropic."
- [14]
Musk wrote on X in July 2026 that he had been "clearly wrong about Anthropic."
- [15]
Musk said abruptly cutting off a paying customer was "not my style."
- [16]
As evidence, Musk pointed to Tesla's 2014 decision to stop suing over its patents and to opening its Supercharger network to other carmakers.
- [17]
Anthropic intends to build its own infrastructure over time to depend less on partners who are also running their own AI labs.
- [18]
Anthropic said it trains and runs Claude across AWS Trainium, Google TPUs and Nvidia chips, and has floated interest in multiple gigawatts of orbital compute with SpaceX.
- [19]
With the extra capacity, Anthropic doubled five-hour rate limits on Claude Code for Pro, Max, Team and enterprise seat plans, dropped peak-hour throttling for Pro and Max, and raised API limits for its Opus models.
- [20]
A 90-day notice period at $1.25 billion a month covers about $3.75 billion of payments.
- [21]
From the May 2026 filing to May 2029 is about 36 months, or roughly $45 billion at $1.25 billion a month.
- [22]
Anthropic's $15 billion annual run rate is about 83% of SpaceX's roughly $18 billion stated annual revenue.
- [23]
The Anthropic and Google contracts together run at about $26 billion a year.
- [24]
Anthropic's $518 billion 10-year compute floor, spread evenly, is $51.8 billion a year.
- [25]
The SpaceX run rate of $15 billion a year is about 29% of Anthropic's average annual compute floor.
- [26]
Cryptopolitan's headline describes the arrangement as an $84.5B compute deal.
- [27]
TechCrunch valued the full deal at about $40 billion for SpaceX's xAI unit.
- [28]
$15 billion a year for 300 megawatts is $50 million per megawatt-year.
- [29]
Across more than 220,000 GPUs, $15 billion a year is at most about $68,000 per GPU a year, or about $7.80 per GPU-hour, assuming the payment covers Colossus 1 alone.
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Sources
2 independent publishers whose own reporting we read for this story.
- benzinga.comAnthropic Discloses up to $84.5 Billion in SpaceX Compute Agreements - Benzinga
1 article · September 29, 2026
- cryptopolitan.com'Clearly wrong': How Musk's Anthropic feud turned into an $84.5B compute deal
1 article · September 29, 2026
- finance.yahoo.comAnthropic filing discloses up to $84.5B SpaceX commitment
1 article · September 29, 2026
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