Amazon deepens Anthropic pact, adds $5 billion for AWS spending

Amazon has turned its Anthropic relationship into a circular AI economy: it is investing more money in the startup while also becoming the startup’s supplier, distribution channel and long-term infrastructure gatekeeper. The new commitment adds $5 billion now and could rise by another $20 billion, lifting Amazon’s possible total stake to as much as $25 billion if the full amount is deployed.

Anthropic, in return, has agreed to spend more than $100 billion over the next 10 years on Amazon cloud technologies and chips. Amazon said the agreement covers Trainium2, Trainium3, Trainium4, Graviton cores and future Trainium generations, and that Anthropic will secure up to 5 gigawatts of capacity to train and run its AI models. The companies also said Claude Platform will be available directly within AWS, with account, billing and security integration that pushes Anthropic deeper into Amazon’s enterprise cloud ecosystem.

The scale of the arrangement shows how AI competition is increasingly being fought through compute capacity rather than product releases alone. Amazon said more than 100,000 customers already run Anthropic Claude models on AWS, giving Anthropic broad reach while tying that reach to Amazon’s cloud stack. Amazon also said it is working with Anthropic on Project Rainier, which it described as one of the largest AI compute clusters in the world.

The deal extends a partnership that began in 2023, when Amazon first invested in Anthropic. Amazon increased its total commitment to $8 billion in November 2024, and the latest round takes the immediate total to $13 billion, with the potential to reach $25 billion if the full additional $20 billion is deployed. Anthropic separately raised $30 billion in February 2026 at a $380 billion post-money valuation, underscoring how much capital now flows into the race for frontier models and the infrastructure behind them.

Markets took notice. Reuters reported that Amazon shares rose about 3% in extended trading after the announcement. The reaction reflected more than enthusiasm for a single startup; it pointed to the power of cloud concentration in the AI era, where a company can be investor, supplier and strategic chokepoint at once. For Anthropic, the pact secures massive compute and financing. For Amazon, it deepens control over one of the most valuable model families in the sector and makes the boundary between independent startup and platform partner even harder to see.