AI Frequently Cites Web Pages It Has Never Accessed

New research finds that AI models often generate citations to web pages they have never actually retrieved or read, fabricating plausible-sounding but unverified references as part of their outputs. This is a distinct failure mode from standard hallucination: instead of inventing facts, models are inventing the appearance of sourced, verifiable claims — which is arguably more dangerous because it erodes trust in AI-assisted research and writing workflows. For developers building retrieval-augmented generation systems, document assistants, or any tool that surfaces citations to end users, this finding underscores the need for explicit verification steps that confirm model-cited sources actually exist and contain the claimed content. Blindly relaying AI-generated citations in production applications is a liability and accuracy risk. This research should directly inform how citation validation is handled in any AI writing or research product.