What is Hallucination?
A hallucination is a confident AI statement that is not supported by any source. It happens because language models predict plausible text rather than look facts up, so gaps in retrieval get filled with fluent invention.
Also known as: AI hallucination, how to stop AI hallucinations.
Hallucination is reduced by engineering, not by prompt wording alone: better retrieval so the right passage is present, strict grounding so the model can only use what was retrieved, citation checks so unsupported sentences are caught, and an explicit refusal path when evidence is thin.
Measure it. A small evaluation set of real questions with known answers tells you more about a deployment than any vendor benchmark.
How Uthereal handles it
Cortex reports the evidence behind each answer, so an unsupported claim is visible rather than hidden in fluent prose.
Related reading
Last updated 2026-09-18 · plain-text glossary for AI tools