How sure a model seems about its own answer.
Model uncertainty is the AI's quiz-show wobble. It slams the buzzer, then whispers, “maybe penguins?”
It tells you how much to trust an answer. It matters in Q&A and medical tools. It matters in automated decisions too.
Hallucination
Higher model uncertainty means more risk of confident nonsense.
Temperature
Temperature can make answers more random, so the model may seem less sure.
Alignment
Alignment helps the model hold back when it is not sure.
RAG
RAG gives the model outside facts, so uncertainty often goes down.