Hallucinated Sources

The failure has three moving parts: missing information, pressure to complete the response, and a system optimized to generate convincing language. Instead of stopping at “I cannot find that,” the model predicts a satisfying answer—and may predict a credible-looking citation along with it. The invented source makes the claim feel independently grounded even though both were generated together. This is why checking only whether an answer sounds right is insufficient: fluent prose and plausible provenance can be products of the same fabrication.

This example shows that models can fabricate provenance when evidence is unavailable; it does not establish that every unsupported answer is false or that every model response contains invented citations. A nonexistent source disproves the attribution, not automatically the underlying claim—which may still be confirmed elsewhere.