But ISRO reached 2 Tons for GSLV just last year, This is rated at 4 Tons, and future improvements to 8 to 10 tons is on cards within 1-2 years. Even a proposal for 15 Tons by 2020.
http://www.thehindu.com/news/national/Mega-launchers-for-ISR... (https://en.wikipedia.org/wiki/SCE-200)