The lights in Colossus hum like a secret. You can almost hear the contracts being scribbled and the legal teams flexing. I watched Elon Musk reduce a headline into a deadline.
I’ve read the S-1, tracked the tweets, and talked to people who breathe data-center deals. You want the short version: what looked like a three-year cash cow may be a six-month rental with a mutual escape hatch. Read on and I’ll show you why that matters to Anthropic, to investors, and to anyone betting on where the AI war for chips goes next.
A guard at the Memphis gate noticed extra vans parked outside before anyone filed a paper
The Colossus facility — SpaceX’s massive compute bunker for xAI and others — suddenly became a stage. Elon Musk announced Anthropic would be using the spare capacity; investors cheered. Then he posted that the arrangement is a 180-day lease with a 90-day mutual notice period, which is short enough to make even seasoned cloud operators squirm.
How long is Anthropic’s lease at SpaceX?
According to Musk’s post on X, the deal is technically a 180-day lease with a mutual 90-day cancellation clause. But the paperwork tells a different story: SpaceX’s S-1 filing with the SEC states Anthropic “has agreed to pay us $1.25 billion per month (€1.16 billion) through May 2029,” and mentions the same 90-day termination right. The public narrative and the investor filing are telling two overlapping stories—and you should read both when judging risk.
A lawyer at an IPO roadshow pointed at the S-1 and the room went quiet
The S-1 reads like a revenue headline: multi-billion-dollar monthly figures that would make any IPO roadshow look healthier. But contracts often have escape hatches; the 90-day mutual cancellation clause gives both sides an off-ramp. Musk insists the short window was SpaceX’s request, not Anthropic’s—a tiny detail that changes the power dynamic.
Can Elon Musk take back the compute?
Yes, in practical terms. Musk even wrote that SpaceX “won’t leave them hanging” but hinted compute could be recalled “if compute gets super tight.” That’s a rare blend of grudging grace and a conditional eviction notice. If demand for chips spikes or Musk decides a strategic internal project needs Colossus, the mutual notice gives him legal wiggle room to prioritize SpaceX’s own needs.
A project manager in the data center mentioned that capacity ramps are rarely instantaneous
Anthropic’s business needs clear runway to scale models; a 180-day horizon is tight. If the S-1 is accurate about fees and capacity ramping in May and June 2026 at reduced rates, then this looks like a staged onboarding that could be paused or stopped depending on business pressures. For Anthropic, that’s operational friction. For SpaceX, it’s revenue flexibility.
Why would Musk prefer a short lease? I see three probable plays:
- Proof of concept for investors: Show that Colossus can monetize idle compute quickly during IPO chatter.
- Leverage: Keep the chips negotiable—available to the highest bidder if demand surges or a strategic need emerges.
- Public theater: Control the narrative. Treat the deal like a teaser to keep competitors and customers on edge.
That blend of theater and leverage feels intentional. At times Musk behaves like a stage manager pulling the curtains to see who applauds and who rushes the stage, and other times like a landlord circling a delinquent tenant sizing up cupboards for rent—both metaphors capture the mix of showmanship and hard-nosed bargaining you’re watching.
How much is Anthropic paying SpaceX per month?
The S-1 claims Anthropic will pay $1.25 billion per month (€1.16 billion) through May 2029, with a slower ramp in May–June 2026 at a reduced rate. That sounds enormous until you remember how hungry state-of-the-art models are for FLOPs and how quickly monthly bills can balloon when models scale to billions of parameters.
You should also factor in optics: announcing massive recurring revenue right before an IPO reassures bankers and taps the market’s appetite for predictable streams. But if the practical lease term is six months, that revenue may be contingent, not committed.
An engineer told me that machine learning crews plan in quarters, not months
Operationally, six months barely covers procurement cycles, let alone iterative model training schedules. Anthropic needs predictable capacity to scale; short-term leases inject cost and scheduling uncertainty. If I were advising a CTO, I’d tell them to budget for churn and build contingency plans across cloud providers and co-location partners.
There’s a broader industry signal here, too: whoever controls racks controls optionality. Companies like Google, AWS, Microsoft, and specialized players such as CoreWeave are watching. If SpaceX keeps compute flexible, that opens a market for spot-like high-performance compute and changes pricing dynamics for GPU and CPU capacity.
You’re left with an awkward question: did SpaceX write a three-year revenue line for the S-1 and give itself a short leash to keep options open for a pivot? For investors, that’s a story worth litigating with your portfolio. For Anthropic, it’s a reminder that capital buys compute—but not always peace of mind.
So who’s actually running the show at Colossus: Musk the financier, Musk the landlord, or Musk the competitor preparing to field his own model? Which version do you think will win the day?