[Glossary](https://telxpress.com/glossary/) / AI # Hallucination A **hallucination** is a confident but false statement produced by an AI model, such as an invented policy, price or appointment slot, and it is the main accuracy risk in any customer-facing AI system. - AI - Updated October 11, 2026 - Written by the Telxpress advisory team 01 In depth ## What it is, why it matters and *what to ask a vendor* Language models generate plausible text; when they lack the facts they may fill the gap with something that sounds right. In a demo this looks like a quirk. On a phone with a customer it becomes a promise your business did not make. Hallucinations are reduced, not eliminated, by grounding the model in retrieved documents, constraining what it may answer and telling it to escalate when unsure. For a growing business the practical defense is design and review. Decide which topics the agent may answer from approved sources, which it must hand to a person, and which it must never discuss (medical, legal or financial advice, for instance). Then read transcripts regularly, because the first weeks reveal the questions you did not anticipate. Ask a vendor how the system behaves when it does not know, whether answers are restricted to approved sources, how they measure accuracy on your content, how corrections are made and how fast they take effect, and whether you can review transcripts. A vendor who claims zero hallucinations has not tested enough. 02 Related terms ## Terms that usually come up *alongside it* - AI ### [Large language model](https://telxpress.com/glossary/large-language-model/) A large language model (LLM) is an AI system trained on vast amounts of text that can follow instructions and generate fluent language; it powers chat assistants and the conversation in AI voice agents. - AI ### [Retrieval-augmented generation](https://telxpress.com/glossary/retrieval-augmented-generation/) Retrieval-augmented generation (RAG) is a technique in which an AI system first looks up relevant documents or records and then answers from them, so replies are grounded in your information rather than the model's memory. - AI ### [AI governance policy](https://telxpress.com/glossary/ai-governance-policy/) An AI governance policy is the written set of rules a business adopts for how AI tools may be used, what data they may touch, who approves them and how their output is checked. - Voice ### [AI voice agent](https://telxpress.com/glossary/ai-voice-agent/) An AI voice agent is software that answers phone calls in natural conversation, understands what the caller wants, answers questions, books appointments and transfers or takes messages when a person is needed. 03 At Telxpress ## Where this shows up *at Telxpress* The pages and articles where this term does real work: what we advise, build and support. - Page ### [AI Consulting & Strategy for Businesses](https://telxpress.com/ai-advisory/) Practical AI roadmaps, tool selection and deployment from advisors who also build it. Book a free AI readiness assessment. - Page ### [Donya AI Voice Agent: Never Miss a Call](https://telxpress.com/solutions/ai/voice-agent/) Donya answers every call 24/7, qualifies leads and books appointments. Call the demo line to hear it. Built and run by Telxpress. - Page ### [AI Agents & Business Automation](https://telxpress.com/solutions/ai/) AI voice, sales and support agents plus CRM and workflow automation, deployed and supported by our team. Based in Irvine, CA. Next step ## Want This Applied *to Your Business?* Book a free 30-minute AI readiness consultation. You'll leave with three AI opportunities specific to your business, whether you work with us or not. [Book My Free Consultation](https://telxpress.com/book/) [Take the Free AI Readiness Assessment](https://telxpress.com/ai-readiness/) [Or call 24/7: (949) 861-4500](tel:+19498614500) Last reviewed: October 11, 2026. Published by Telxpress, Irvine, CA.