Hmm I wonder if we just have different settings for it or use it differently. I mostly use SwiftKey these days as a fix for my terrible typing, rather than as predictive text. The predictive text is pretty bad in my opinion, but I'll tell you what SwiftKey thinks about itself below.
(prompt in bold) SwiftKey predictive text is not associated to my records and the other two phases are slack and the other two phases are slack and the other two phases are slack (end of predictions)
It seems Microsoft hasn't added GPT to it yet... Can't even remember the last time I talked about slack.