Nearly 40% of links under AI search answers go uncited: a test on DeepSeek and Yuanbao

39.3% of the links at the bottom of DeepSeek and Yuanbao answers did not appear in any sentence of the text. The measurement from arXiv preprint 2607.15771 of Jul 17, 2026 analyzed 160,860 cleaned citations: 614 questions, three runs for each assistant and interface combination.