https://www.cnet.com/news/red-dead-redemption-2-has-highest-grossing-opening-weekend-of-any-game-ever/

Rockstar also says that with over $725 million in sales, Red Dead 2 is the second highest-grossing entertainment launch of all time. What's No. 1? Grand Theft Auto V, another game made by Rockstar, which earned $1 billion in sales during its first three days. 

Although, Rockstar still says Red Dead 2 has the highest-grossing opening weekend, which is technically correct since GTA V was released on a Tuesday -- so its $1 billion launch occurred during weekdays.