With MacOS Sequoia 15.4 Beta (24E5206s) and Xcode 16.3 beta (16E5104o), Predictive Code Completion no longer works. Prior to the update, (as of yesterday) completion worked under Xcode 16.2 and MacOS 15.3 Beta. The models are already loaded.
So far, I've found the Predictive Completion to be useful in some situations (eg multiple cases in a switch), variably reliable in others (eg code suggestions in a CoreData stack) and downright wrong & annoying in others (eg referring to functions / modules that don't exist).
Regards, Michaela
Could you try restarting your Mac, and seeing if that makes a difference? If not, please file a bug report with an Xcode sysdiagnose included so that we can look into this further.
— Ed Ford, DTS Engineer