The 64 GB comes in two colours- Gunmetal and Soft Gold, while the 128GB models comes in Gunmetal colour only.
The smartphone will only be exclusively available on Amazon midnight of December 14. The company's current flagship OnePlus 3, launched in June this year, is priced at model costs Rs 27,999.
The new smartphone is an improved version of its predecessor, One Plus 3. OnePlus 3T has a faster chipset, better front-facing camera and bigger battery. However, its overall design is same as that of OnePlus 3.
The new smartphone supports dual-SIM and runs OxygenOS v3.5.3 based on Android 6.0 Marshmallow and has a 5.5-inch Full HD (1080x1920 pixels) Optic Amoled display. The smartphone also comes with OnePlus' software-based display tweaks like Night Mode, Light/Dark theme and Accent colours.
The company also announced that both OnePlus 3 and OnePlus 3T will receive Android 7.0 Nougat update later this year. OnePlus 3 beta testers have already started receiving Android 7.0 Nougat-based OxygenOS Open Beta 8.
OnePlus 3T is powered by Qualcomm's newest chipset, Snapdragon 821 which iscomplemented by 6GB of RAM, in line with wide speculations.
The new smartphone has a 16MP primary camera with a Sony IMX298 sensor and LED flash. The camera is capable of recording 4K video, as well as slo-mo (120fps) videos in HD resolution. It boasts of features like Optical Image Stabilization, Electronic Image Stabilization and Phase Detection Autofocus (PDAF). Some of the other features include Auto HDR, Dynamic denoise and Manual mode. The OnePlus 3T comes with a 16MP front-facing snapper with a Samsung sensor.
The OnePlus 3T is backed by a bigger 3,400mAh non-removable battery vis-a-vis OnePlus 3's 3000 mAh. The smartphone also comes with 'Dash Charge' fast-charging technology and fingerprint sensor.