Anthropic said Friday that longtime backer Amazon had pumped an additional $4 billion into the artificial intelligence startup, doubling its investment in the firm known for its GenAI chatbot Claude.Amazon will maintain its position as a minority investor and will be Anthropic’s main training partner for AI models, the startup said.Amazon, which is Anthropic’s primary cloud partner, is fiercely competing with Microsoft and Alphabet’s Google to offer AI-powered tools for its cloud customers. 3 Anthropic is ...