GTA5 generated $800 million in first day sales

"Take-Two Interactive Software, Inc. (NASDAQ:TTWO) today announced that Grand Theft Auto V delivered the highest first day retail sales of any title in the history of the Company and the Grand Theft Auto series. Launched on September 17 for the PlayStation®3 computer entertainment system and the Xbox 360® video game and entertainment system from Microsoft, the title has already received widespread critical acclaim and achieved first day sell-through of more than $800 million worldwide, excluding the upcoming launch in Japan and Brazil, according to Company estimates.
“All of us at Take-Two are thrilled with the initial response to Grand Theft Auto V. Once again, the team at Rockstar Games have outdone themselves, setting the entertainment industry's new standard for creativity, innovation and excellence," said Strauss Zelnick, Chairman and CEO of Take-Two. “Beginning at midnight on Monday, consumers around the world gathered in anticipation to be among the first to experience the evolution of this remarkable series. In North America alone, more than 8,300 stores opened their doors at midnight to welcome fans whose loyalty and enthusiasm were rewarded with what The New York Times called ‘the most immersive spectacle in interactive entertainment’. We are incredibly proud of Rockstar Games’ creative achievement and could not be more pleased with the success of this launch.”"
Source:  Press release from Take-Two Interactive Software, 18th September 2013
Update - $1bn in 3 days