According to Official Guinness Records,
The highest break possible in 6 Reds Snooker is 83 and was first achieved by Wael Talaat (Egypt) during the 2014 ISBF World 6 Red Snooker Championships in Sharm El Sheikh, Egypt, on 20 June 2014.
For a complete list of 2014 records, please visit 2014 Guinness Records in Singapore.