In November 2024, Amazon invested an additional $4 billion in Anthropic (maker of Claude), doubling its total investment to $8 billion.
AWS became Anthropic's primary cloud and training partner. Amazon also opened Project Rainier, one of the world's largest AI compute clusters.
Anthropic's valuation soared — by September 2025, the company completed a $13 billion Series F round at a $183 billion valuation. Amazon reported a $9.5 billion pre-tax gain on its stake.