#Rust
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
Open-Sourcing X's Recommendation Algorithm: Phoenix RecSys Engine & Visibility Filtering Breakdown
xAI has open-sourced the latest codebase for the X recommendation algorithm. This release details the Rust-based 'Phoenix' RecSys engine, the Home Mixer pipeline, and the comprehensive visibility filtering rules governing content moderation.
High Impact5minbc8e5f0Aug 31, 2026
TwitterAlgorithmxAIPhoenixRecSys