The Xiaomi Mi A1 was launched under the Android One program, which makes steady software updates a certainty. The device was slated to receive its Oreo update in December and there's a slim chance that deadline may actually be met, as beta testing for Oreo has finally kicked off.
https://www.notebookcheck.net/Xiaomi-Mi-A1-set-to-begin-beta-testing-for-Oreo-update.268182.0.html