---
title: What is Hallucination? · Aeonav
description: When a model states something false or invented with the same confidence as a fact.
canonical: https://www.aeonav.fivecoder.com/glossary/hallucination
updated: "2026-09-22"
---

[AI search glossary](http://www.aeonav.fivecoder.com/glossary)

# Hallucination

When a model states something false or invented with the same confidence as a fact.

Hallucinations happen because models predict plausible text, not verified truth. Applied to your brand, that can mean a wrong price, a feature you do not offer, or a confident claim with no basis.

Grounding and good source material reduce the risk. Monitoring matters too, since the only way to catch a hallucination about your brand is to look for it.

## Go deeper

- [Do AI engines fact-check what they read?](http://www.aeonav.fivecoder.com/blog/ai-search-fact-checking)
- [Full AEO guide](http://www.aeonav.fivecoder.com/answer-engine-optimization)

## Related terms

[Grounding](http://www.aeonav.fivecoder.com/glossary/grounding)[AI brand sentiment](http://www.aeonav.fivecoder.com/glossary/ai-brand-sentiment)

## See it in your own data

Aeonav is an open-source AI visibility platform. Self-host it for free and track how AI answer engines mention and cite your brand.

[Get started](http://www.aeonav.fivecoder.com/docs/getting-started)[Compare tools](http://www.aeonav.fivecoder.com/ai-visibility-tools)