XDA developers found traces of playing OnePlus 9 and 9 Pro in the OnePlus system. Now, TechDroider has exposed the OnePlus 9 and 9 Pro models, among which the OnePlus9 model is LE2110, and the OnePlus9 Pro models are LE2117, LE2119, and LE2120.

we learned that XDA member Some_Random_Username had discovered the code name lemonade for the Oneplus 9 series. In particular, there are five variations of Lemonade, which, based on the oneplus code name, identifies these devices as:
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https://www.igeekphone.com/oneplus-9-9-pro-revealed-snapdragon-875-there-are-4-new-models/