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Glossary · Artificial Intelligence

What is Hallucination?

When an AI model confidently states something false or made up.

In more detail

It happens because the model generates likely-sounding text without checking facts. References, numbers and niche topics are especially risky.

Example

An AI inventing a research paper that does not exist.

Learn it properlyAI Hallucinations: Why AI Makes Things Up and How to Check It9 min lesson · Artificial Intelligence

Related terms

AI AgentAn AI system that can plan steps and use tools — search, code, apps — to complete a task with less step-by-step instruction.Artificial Intelligence (AI)Software that learns patterns from data and uses them to make predictions, decisions or new content.Bias (in AI)Systematic unfairness in AI output, usually inherited from imbalanced or historical training data.Context WindowThe maximum amount of text a language model can consider at one time.Deep LearningMachine learning that uses neural networks with many layers, especially good for images, audio and language.Fine-TuningFurther training a pre-trained model on a smaller, specific dataset to adapt it to a task or style.