The $45 Billion Lease That May Last Six Months

SpaceX filed an S-1 on May 20 describing a compute agreement with Anthropic worth $1.25 billion per month through May 2029. Elon Musk, on May 28, said the actual term is 180 days with mutual 90-day cancellation rights. Both claims cannot be fully right at the same time, and the discrepancy is sitting inside an active SEC filing window with no formal correction attached.

What the S-1 says. The SpaceX registration statement, filed as part of its IPO process, characterises the Colossus compute agreement as a cloud services contract signed May 3, 2026, under which Anthropic "has agreed to pay a monthly fee through May 2029." The $1.25 billion per month figure appears on four separate pages of the filing, per TechCrunch's reading. The S-1 does include a termination clause, noting the agreement "may be terminated by either party upon 90 days' notice." That clause is also repeated in multiple sections. The headline number implies a total contract value of roughly $45 billion. The termination clause implies that $45 billion commitment is, at any moment, 90 days away from zero.

What Musk says. On May 28, Musk posted on X that SpaceX "has not committed to leasing Colossus for years," describing the structure as "a 180 day lease with 90 day notice mutual cancellation thereafter." Reuters confirmed the characterisation. Business Insider and The Next Web reported the same day. Musk framed the short base term as SpaceX's preference, not Anthropic's.

The disclosure gap. Here is the part that matters for underwriters. The S-1 does disclose the 90-day termination right, so the cancellation mechanism is not hidden. What the S-1 does not disclose, based on current public reporting, is the 180-day base term that Musk describes as the firm committed period. If a contract has a 180-day base term and then rolls with 90-day mutual cancellation rights, the distinction between "committed" and "contingent" changes materially at the 180-day mark. Presenting the agreement as a May 2029 commitment, across four pages, while omitting the base-term structure is unusual drafting for a registration statement.

Under SEC Regulation S-K (the rules governing what must go in a registration statement), material contracts must be described accurately in both their upside and their risk. If the 180-day base term is accurate, a reasonable investor reading the S-1 would be receiving a less conservative picture of SpaceX's forward revenue certainty than the contract actually supports. Underwriter exposure in that scenario is not hypothetical.

The inference-economics read. Step back from the legal question for a moment and consider what the two characterisations imply for Anthropic's compute position. The $1.25 billion per month rate is consistent with the compute-capacity lift Anthropic announced around its Series H fundraise (annual recurring revenue, or ARR, is the annualised run-rate of revenue a company receives from subscriptions or recurring contracts). Analysts pricing the Series H at approximately $61.5 billion treated the scale of Anthropic's compute agreements as evidence of operational moat: if you have locked in supply at Colossus scale, you are insulated from spot-market GPU pricing volatility.

A 180-day base term with a 90-day exit right is not a moat. It is a rolling option. The difference matters because inference economics (the cost of running AI models in production, as opposed to the cost of training them) is the binding constraint for frontier labs right now. At $1.25 billion per month, a single cancellation cycle represents $3.75 billion in potential uncommitted spend. The compute "anchor" priced into the Series H is, on Musk's characterisation, repriced as a near-term bridge.

The contrarian case. There is a reading under which both characterisations are simultaneously accurate. If the Colossus agreement is structured as an auto-renewing 180-day contract that extends through May 2029 in the absence of a 90-day cancellation notice, the S-1 language could be describing the contractual ceiling (what happens if neither party ever terminates) while Musk is describing the contractual floor (what SpaceX has actually committed to). Standard practice in material-contract summaries does tend toward disclosing maximum term rather than minimum committed term.

Four pages of identical "through May 2029" language is unusual drafting for that interpretation, but it is a live reading that underwriters may be relying on.

The S-1 does disclose the termination clause. What it does not appear to disclose is which party has actually committed to anything.

Musk's option. There is an obvious strategic dimension to Musk's clarification. Colossus is a 100,000-GPU cluster operated by xAI in Memphis, currently the largest single GPU cluster publicly disclosed. A 90-day cancellation right means SpaceX or xAI can reclaim that cluster for Grok training (Grok is xAI's large language model) on roughly one quarter's notice. Musk has been public about Grok's compute roadmap and xAI's ambitions. Locking Colossus to Anthropic through May 2029, on the S-1's reading, would foreclose that option entirely. Musk's X post is consistent with him not wanting investors or Anthropic's lawyers to treat the May 2029 language as binding.

The performativity point. Whether the commitment is $45 billion locked or $3.75 billion soft, Anthropic is spending at a rate that constitutes material market-shaping behaviour. AI performativity (the thesis that capital expenditure at scale becomes self-fulfilling regardless of near-term delivery, because it shapes supply chains, talent, and competitive position) operates whether the contract is firm or rolling. The gap between the two characterisations matters less for "is Anthropic a serious compute buyer" and more for "what did Series H investors actually price."

What to watch. Three things resolve this. First, an S-1 amendment from SpaceX or a formal clarification from underwriters. That would carry SEC weight in a way Musk's X post does not. Second, Anthropic's public posture: if Anthropic confirms the 180-day structure, the S-1 characterisation is at minimum a drafting problem. Third, the first renewal decision: if the agreement rolls past the initial 180-day window without public event, the auto-renewal reading gains credibility. If either party exercises the 90-day exit before November 2026, the S-1's four pages of "through May 2029" language will look, retrospectively, like a significant disclosure gap.¹²³⁴

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