Musk says X updated its timeline recommendations with new AI ranking and retrieval models

Elon Musk announces on X that the platform has made two changes to timeline recommendations: a new AI ranking model that predicts the time users will probably spend on a post, and a retrieval model trained to surface posts users read all the way through.

Musk says user active seconds are growing exponentially and reaching all-time highs almost every day. The report contains only Musk's own statements, and no independent data on the claimed usage figures is given.