The Nougat-based custom ROM developed by the former Cyanogen team now offers the same build for the OnePlus 3T and the older OnePlus 3. The other additions to the list of supported devices are ZTE Axon 7, HTC One M7, and the LG G3 on Sprint.
http://www.notebookcheck.net/LineageOS-14-1-hits-OnePlus-3T-ZTE-Axon-7-and-others.197114.0.html