https://wccftech.com/oneplus-9rt-comes-with-a-new-soc-and-better-cameras-for-under-600/

Although OnePlus cleared out that there will not be any T-series phone this year, that only applied to the OnePlus 9T. Instead, the company has decided to launch the OnePlus 9RT, which seemingly is a follow-up to the OnePlus 9R released earlier this year.

The most significant upgrade that you are getting here is the Snapdragon 888 chipset. You are also getting access to 8/12GB RAM, as well as a choice between 128/256GB of UFS 3.1 storage.