The Culture Funnel: You Can't Align What isn't in the Data

In three linesLLMs suffer from a 'cultural data funnel': explicit cultural signals decline sharply during post-training, dominated by geographically concentrated data. A study using multidimensional tagging across 5.6M samples shows multilingualism enhances geographic diversity but not balanced representation. Authors release a culturally tagged dataset to improve training data pipelines.

Summary generated by Claude — human-verified