Elon Musk’s xAI started life as a challenger to Anthropic. Now it’s helping keep Anthropic’s models running. That’s the reversal at the center of a new report from The Information, which details how xAI went from chasing Anthropic in the model race to powering it on the infrastructure side.
The short version: a company built to compete with Anthropic on frontier AI is now a supplier to it. For an industry where compute is the scarcest resource going, that’s a notable shift.
What happened
The Information reports that xAI, the AI lab Musk launched in 2023, has moved into a role where it provides computing muscle that benefits Anthropic. xAI spent its first two years racing to catch up on models, pouring resources into its Grok chatbot and building one of the largest GPU clusters in the world, the Colossus supercomputer in Memphis.
That buildout is the key. When you assemble that much hardware, you don’t just train your own models with it. You have capacity, and capacity is something every AI lab is desperate for right now.
Why this matters
Compute is the chokepoint of the AI industry. Training and serving frontier models takes enormous fleets of chips, and demand is running far ahead of supply. Labs are signing multibillion-dollar deals for access to data centers and accelerators, and the ones who lock up capacity hold real leverage.
Anthropic has been aggressive here. It leans on Amazon, its largest investor, for AWS Trainium chips, and it struck a deal for large numbers of Google TPUs. Adding another source of compute fits a clear pattern: spread your bets so no single supplier or chip shortage can throttle your roadmap.
What stands out is who the new source is. Musk and Anthropic are not friendly. He’s sued OpenAI, sparred publicly with rival labs, and positioned xAI as the contrarian player. Seeing his infrastructure end up powering a direct competitor shows how the economics of compute can override the rivalries.
The bigger picture
This is the AI industry’s version of “coopetition,” where companies compete on products and cooperate on plumbing. A few forces are pushing it:
- Scarcity. There aren’t enough chips and data centers to go around, so even rivals become customers.
- Sunk cost. Massive clusters like Colossus are expensive to build and idle. Selling spare capacity turns a cost center into revenue.
- Diversification. Labs like Anthropic want multiple compute sources to avoid being hostage to one vendor.
We’ve seen versions of this before. Cloud providers host workloads for companies that compete with their own services all the time. Amazon backs Anthropic while running its own AI ambitions. Google sells cloud to firms it competes with. xAI supplying Anthropic is the same logic, just between two labs that brand themselves as opposites.
What to watch next
For practitioners and anyone tracking the AI race, a few things are worth keeping an eye on:
- xAI as an infrastructure business. If Musk’s lab is selling compute, it’s not just a model company anymore. That changes how you read its fundraising and its Memphis expansion.
- Anthropic’s supplier mix. Each new compute source makes Anthropic more resilient and less dependent on any single backer.
- More rival-to-rival deals. If this works, expect other labs to quietly buy and sell capacity to each other rather than let expensive hardware sit unused.
The takeaway is simple. In AI right now, owning the compute can matter as much as owning the best model, and the companies fighting hardest for the lead are increasingly willing to do business with the people they’re trying to beat. Full details are in The Information’s report.