# Sona: one transformer replaced our 15+ candidate generators, pre-ranker and ranker in an A/B test [R] > Source: > Published: 2026-10-05 17:00:37+00:00 Our production recommender at Yandex Music has 15+ candidate generators feeding pre-ranking and ranking models with hundreds of features. LLMs showed that one end-to-end model can take over work that used to be split across specialized components, and single-model generative recommenders have carrie