As we wait for the Xiaomi Mi 6 to become official at some point this month, someone in possession of a prototype decided to put it through the paces of GFXBench for Android. Thankfully, that has resulted in a pretty complete list of specs of the device becoming public in the benchmark's database. GFXBench refers to it as "Xiaomi Sagit" but the chipset it has clearly reveals that this is indeed the Mi 6 we're talking about. The handset thus features a 5.1-inch 1080p touchscreen, a 12 MP rear camera with 4K video recording, and an 8 MP selfie shooter that's also capable of snapping 4K...
Source: http://www.gsmarena.com/xiaomi_mi_6_has_most_specs_revealed_by_gfxbench-news-24417.php