Amazon has increased its investment in Anthropic by $2.75 billion, making its total investment $4 billion. Anthropic, a start-up competing in the A.I. field, has seen its value triple to $15 billion in just a year. The investment includes gaining access to A.I. systems and commitments to provide computing power. FTX, a bankrupt cryptocurrency exchange, has sold two-thirds of its shares in Anthropic for $884 million. Other buyers include the firm linked to a sovereign wealth fund in the UAE, a quantitative trading firm, and the Ford Foundation, which views Anthropic as an important competitor to OpenAI.