After some leaks online, OnePlus just made their first ever smartphone with 18:9 display aspect ratio official in their by-invitation in New York City
It is the OnePlus 5T. In specs, It has Oxygen OS based on Android 7.1 Nougat, 6.01 inch FHD+ Optic AMOLED Sunlight display resulting to 80.5% of screen to body ratio, Qualcomm Snapdragon 835 processor with Adreno 540 GPU, dual 16 + 20 MP rear camera system with the same implementation on OnePlus 5, 16 MP selfie camera, 6 GB RAM/64 GB ROM or 8 GB RAM/128 GB ROM options, rear mounted fingerprint sensor, LTE, Bluetooth, WiFi, GPS, USB Type C, Face Unlock technology, alert slider key, has 7.25 mm. thickness, still with 3.5 mm. audio jack and 3,300 mAh built-in battery with Dash Charge support
In addition, they mentioned that the said custom OS based on Android 8.0 Oreo update will arrive this early 2018.
OnePlus 5T is priced at US$ 499 (6 GB RAM) and US$ 559 (8 GB RAM). It will be available first in US, Europe and India starting November 21
Screengrabs from OnePlus 5T launch livestream