https://www.theverge.com/circuitbreaker/2018/10/17/17989632/oneplus-6t-leak-max-onboard-storage-256gb

The OnePlus 6T — which is due to be revealed on October 30th and released on November 6th — will be available with up to 256GB of internal storage, according to a leak published by MySmartPrice. The device will reportedly be available with a choice of 126GB or 256GB of onboard storage, with the smaller of the two available with either 6GB or 8GB of RAM. (The larger device will only have the latter.)

If true, this latest leak suggests that the OnePlus 6T will have more or less the same internals as its predecessor. Where the 6T is expected to make big changes is with its design. It will reportedly drop the 3.5mm headphone jack, minimize the display notch, and move the fingerprint scanner from the rear of the device to underneath the screen.