Inside X's Open-Source Algorithm: Phoenix RecSys, Author Cold Start, and Mutual Follow Mechanics
A major open-source update to the X algorithm repository reveals the inner workings of the next-generation 'Phoenix (xrex)' neural recommendation framework, Rust-based Home Mixer enhancements for author cold-start scoring and mutual-follow metrics, and low-latency visibility filtering subsystems.
High Impact5min902a06fSep 7, 2026 TwitterAlgorithmRecSysPhoenixMachineLearning