https://techcrunch.com/2024/03/27/amazon-doubles-down-on-anthropic-completing-its-planned-4b-investment/

Amazon invested a further $2.75 billion in growing AI power Anthropic on Wednesday, following through on the option it left open last September. The $1.25 billion it invested at the time must be producing results, or perhaps they’ve realized that there are no other horses available to back.

The September deal put $1.25 billion into the company in exchange for a minority stake, and certain tit-for-tat agreements like Anthropic continuing to use AWS for its extensive computation needs.