Amazon is investing up to $4 billion in startup Anthropic as it looks to stake a claim in the AI arms race. Both stand to benefit: Amazon, with a buzzy customer for its custom AI chips and a minority stake in one of the early applications of generative AI, while Anthropic gets a big backer and AWS’ compute power. This isn’t, however, the exclusive partnership with Microsoft and OpenAI inked earlier this year, since Anthropic already received a partnership and investment from Google in May.