Bloomberg’s Mark Gurman last month reported that Apple was considering delaying at least some of its promised Apple Intelligence enhancements for Siri until iOS 18.5, and that plan appears increasingly likely based on his latest information.
Gurman said Apple was initially planning to launch the Apple Intelligence enhancements for Siri in iOS 18.4, but it seems that the features have been pushed back until iOS 18.5 due to a lack of readiness and software bugs. Accordingly, none of the promised features are available in the first beta of iOS 18.4 released last month.
Source: Apple Intelligence Upgrades for Siri Likely Pushed Back to iOS 18.5