Amazon is investing an additional $4 billion in Anthropic, a startup that specializes in artificial intelligence, bringing the total investment to $8 billion. Anthropic will use Amazon Web Services (AWS) as its primary cloud and training partner, utilizing AWS Trainium and Inferentia chips to train and deploy its largest AI models. This partnership will also allow AWS customers to have early access to Anthropic's features, such as fine-tuning with their own data on Anthropic's Claude chatbot. The investment is part of a larger trend of tech giants investing in AI startups to stay competitive in the market.