The OnePlus Open introduces several changes over its predecessor:

1. Display: The OnePlus Open features a larger 7.82-inch AMOLED main display when unfolded, compared to the previous 7.6-inch screen on older models. It also has a 6.31-inch cover display, providing a more comfortable and expansive outer screen experience​(PhoneArena).
2. Processor: Powered by the Snapdragon 8 Gen 2 processor, the OnePlus Open offers improved performance, making it one of the fastest foldable phones available​(PhoneArena).
3. Camera: The camera setup has been significantly upgraded, featuring a 48MP main camera, a 64MP 3x telephoto camera with up to 120x digital zoom, and a 48MP ultra-wide camera. This enhanced camera system provides a substantial leap in photography capabilities compared to previous OnePlus foldables​(PhoneArena).
4. Battery and Charging: The OnePlus Open comes with a 4,805mAh battery and supports 67W SUPERVOOC fast charging, making it one of the quickest-charging foldable phones​(PhoneArena).
5. Design: It is currently one of the thinnest and lightest foldables, weighing 239g (black variant) and 245g (green variant) with a durable hinge mechanism tested for up to 1 million folds​(PhoneArena).
6. Water Resistance: It offers IPX4 water resistance, allowing for some protection against splashes, but it is not designed to handle full immersion in water​ (TechRadar).

These updates make the OnePlus Open a premium and powerful foldable, with notable improvements in the display, camera, and battery over prior models.