A mini version of the OnePlus 2 was rumored throughout its existence, and instead the OnePlus X was born, which wasn't exactly the same thing. Mini flagship lovers have been left out in the cold completely after Sony scrapped the Z-series and the Xperia Z5 Compact is the last one to cater to that demographic (plus the iPhone SE, but that's a different little beast). Well, OnePlus might be filling that niche after all, if this new GFXBench listing is any indication. A 4.6-inch FullHD display is enough to capture mini fans' attention, and the Snapdragon 820 plus 6GB of RAM should get them...
Source: http://www.gsmarena.com/could_there_be_a_46_oneplus_3_mini_finally-news-19769.php