Elon Musk’s xAI, recently rebranded as SpaceXAI, is leasing its Colossus 1 AI supercomputer to Anthropic in a deal projected to generate $5 to $6 billion in annual revenue. The arrangement, announced on May 6, 2026, hands a direct competitor access to more than 220,000 NVIDIA GPUs while xAI shifts its own workloads to the newer Colossus 2 cluster.
The lease comes at a strategically convenient moment. xAI is reportedly positioning for an IPO that analysts estimate could value the company at $75 billion or more. Turning idle silicon into a multi-billion-dollar revenue stream right before going public is, to put it mildly, not an accident.
What Colossus 1 actually is, and why Anthropic wants it
Colossus 1 was xAI’s flagship supercomputer, built at a pace that raised eyebrows across the industry. The initial build was completed in just 122 days back in 2024. The cluster packs more than 220,000 NVIDIA GPUs, including H100, H200, and GB200 models. The lease provides Anthropic with 300 megawatts of compute capacity, which the company plans to use for training and running its Claude family of models.
For Anthropic, this is about raw compute access in a market where GPUs remain scarce relative to demand. The company, backed by a $5 billion commitment from Amazon, has been scaling its Claude models aggressively and needs the horsepower to keep pace.
For xAI, the company has already migrated its primary training operations to the more advanced Colossus 2 infrastructure. Colossus 1 was sitting largely idle. Rather than let hundreds of thousands of GPUs depreciate in a warehouse, xAI opted to lease them to someone willing to pay a premium.
The IPO math and what $5B in lease revenue means
xAI raised $20 billion in a Series E funding round in January 2026 to expand its AI infrastructure. A $5 to $6 billion annual lease arrangement transforms what was a depreciating capital asset into a recurring revenue line. If the company’s IPO valuation lands at or above the speculated $75 billion mark, this Anthropic deal will be a significant reason why.
The deal also establishes infrastructure-as-a-service from one frontier lab to another. Cloud providers like Amazon, Microsoft, and Google have been the traditional middlemen for GPU compute. xAI is cutting out the cloud layer entirely and leasing directly.
Competitive dynamics and what investors should watch
Anthropic gains access to a massive compute cluster without the multi-year lead time of building one. That could accelerate its model development timeline and make Claude more competitive in the enterprise AI market. OpenAI and Google, both of which have invested heavily in their own infrastructure, now face a rival that can scale compute capacity through leasing rather than construction.
Anthropic is now reliant on a competitor’s hardware for a significant portion of its training capacity. If xAI decides to reclaim Colossus 1 for its own use, or if the lease terms change at renewal, Anthropic could face a sudden compute crunch.
xAI has recently faced legal challenges related to AI regulations in Colorado, and an IPO would subject SpaceXAI to public company disclosure requirements and potentially greater regulatory scrutiny.
Investors eyeing either company should watch three things closely: the specific lease terms and duration when they become public, whether Anthropic reduces its reliance on Amazon’s cloud infrastructure as a result, and how xAI prices its IPO relative to the new revenue baseline this deal creates. A $75 billion valuation with $5 to $6 billion in infrastructure lease revenue implies the market is pricing in substantial additional growth from xAI’s own AI products, not just its role as a compute landlord.