xAI Open-Sources New X Recommendation Algorithm: Transformer-Powered Architecture Featuring FlashAttention-4 and CuTe DSL
xAI has open-sourced the modernized X recommendation algorithm under the 'Phoenix/xrex' stack. The update introduces a full Transformer-based ranking architecture leveraging CuTe DSL, FlashAttention-4 variable-length attention kernels, and sequence packing to process user engagement sequences efficiently.
High Impact5mincb45b55Oct 12, 2026 XAlgorithmxAIMachineLearningTransformer