Grand Theft Auto The Trilogy by Take-Two Interactive Software Inc is seen for sale in a store in Manhattan, New York City, U.S., February 7, 2022.
The unprecedented leak included dozens of videos showing robberies, gunplay and open-world driving and was posted on an online message board.
An admin for the message board, GTAForums, said Take-Two had asked for the copyrighted material to be taken down.
"Based on what we see, the game is further along than many believe and (the leak) won't impact game reception/sales," Jefferies analysts said.
GTA VI is estimated to generate bookings of $3.5 billion at launch and an annual average of $2 billion thereafter, according to BofA Global Research.