IGN.com / 14.10.26

Rockstar Pushes Back on Rumor GTA 6 Cost More Than $1.5 Billion to Make, but It's Still Probably the Most Expensive Video Game of All Time

Rockstar has insisted GTA 6 did not cost more than $1.5 billion to make, countering an online rumor, but its still probably the most expensive video game of all time.
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Other sources

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  GamesRadar.com 14.10.26

  Rockstar still won't reveal cost of GTA 6 development, but it's definitely not previously rumored $1.5 billion

• Polygon.com 14.10.26

  GTA 6's Most Unbelievable Rumor Confirmed Actually Real