it's just based on rumors of private investor discussions of people involved with anthropic. but they are not controversial from what I can see. 2T was their initial plan, apparently updated to 1.5T sometime in october. e.g. https://www.investing.com/news/stock-market-news/exclusivein...
also, they previously already got some investments on a close to 1T valuation (in may).
also, they previously already got some investments on a close to 1T valuation (in may).