Amazon’s cloud computing arm Amazon Web Services Tuesday announced plans for an “Ultracluster,” a massive AI supercomputer made up of hundreds of thousands of its homegrown Trainium chips, as well as a new server, the latest efforts by its AI chip design lab based in Austin, Texas. The chip cluster will be used by the AI startup Anthropic, in which the retail and cloud-computing giant recently invested an additional $4 billion. The cluster, called Project Rainier, will be located in the U.S. When ready in 2025, it will be one of the largest in the world for training AI models,...