Amazon is deepening its partnership with Anthropic and will invest an additional $4 billion in each other. In September, artificial intelligence startup Anthropic was seeking a new round of financing at a valuation of up to $40 billion. Anthropic is a company founded in 2021 by former OpenAI executives to focus on creating explainable, secure, and manipulable artificial intelligence systems. The company's flagship artificial intelligence model, Claude, runs on "Constitutional AI," an artificial intelligence model that uses predefined principles to guide its output, avoiding some erroneous or discriminatory output reactions.