Google Nexus 6P and 5X had been the flagship phones of the search giant in 2015. Two years down the line, Google has announced, in its support page that both Nexus 5X and Nexus 6P get security updates until November 2018.
The same timeline applies to guaranteed telephone and online support as well. The devices will also stop getting Android version updates after this month.
For Nexus 6P and Nexus 5X, to check if the phone has received any update, go to System -> System updates. The update status will be displayed and please follow on-screen instructions to complete the update process.
To recall, Nexus 6P features 5.7-inch AMOLED screen, Qualcomm Snapdragon 810 processor, Adreno 430 GPU, 3GB RAM, 32/64/128GB storage, 12.3MP primary camera and 8MP secondary camera. Nexus 5X features 5.2-inch LCD screen, Snapdragon 808 processor, Adreno 418 GPU, 2GB RAM, 16/32GB storage, 12.3MP primary camera and 5MP secondary camera.
For Nexus 9 and Nexus 6, the security updates are guaranteed only up to October 2017 and this timeline is applicable for telephone and online support as well.