Android Oreo Go features a handful of Google apps including the GoogleGo, Google Assistant Go, Maps, Gmail, YouTube Go, and other light-weight stuffs.
The Android 8.1 Oreo Go is designed to run better on phones with either 512MB or 1GB of RAM. However, that doesn't mean it will be available for every low end device.
"With the launch of Android Oreo (Go edition) in Android 8.1, partners will soon be able to ship this new release on their entry-level devices around the world. We can’t wait for our partners’ devices to hit shelves in the coming months. - Google"