A new leak suggests that the OnePlus 8T will retail at €599 (US$703) in Europe. It is contradicted by another report, which states that the starting price could be as high as €799 (US$937). OnePlus will officially unveil the device on October 15, so it shouldn't be long before we know for sure.
https://www.notebookcheck.net/The-OnePlus-8T-will-reportedly-cost-EUR599-US-703-in-Europe.494888.0.html