Project Rainier is the next flagship AI training cluster that AWS is building for Anthropic using Trainium2.1 Its performance will be 5x that of Anthropic’s largest training cluster as of 2025.2
It will be located in the continental US and will have “hundreds of thousands” of accelerators and be distributed “across the U.S.” as a single system2 (see multicluster training). It will be deployed in 2025.