Android 17 is the first since 3.x to add new APIs without releasing to the AOSP

Android 17 QPR1 is the first release since Android Honeycomb (3.x) adding new APIs for app developers without a release to the Android Open Source Project. The new APIs are currently exclusive to the Pixel OS and aren't available to other Android OEMs. https://developer.android.com/sdk/api_diff/37.1/changes