According to Official Guinness Records,
The heaviest bench press in a single lift is 401.5 kg (885 lbs 2 oz) achieved by Blaine Sumner (b.22 June 1987;USA) at the 2016 Arnold Sports Festival held in Columbus, Ohio, USA, on 5 March 2016.Blaine also squat-lifted 500 kg during the competition. His bodyweight at the time was 167.51 kg.
For a complete list of 2016 records, please visit 2016 Guinness Records in United States.