Galileo's Prompt Perplexity Metric is a tool that measures the confidence of an AI model in predicting its outputs, ensuring accuracy, consistency, and reliability. It evaluates the predictability and structural coherence of a model's responses, providing insight into how well the model understands and follows input prompts. High perplexity scores often indicate hallucinations or inconsistencies, flagging responses that may deviate from expected outputs. The metric is crucial for precision, security, and AI performance optimization professionals, enabling them to assess and improve AI model performance by tracking response confidence, refining prompt design, training data, and fine-tuning strategies. By analyzing perplexity scores, teams can identify areas where models struggle to produce coherent responses and apply targeted improvements, ensuring stable and predictable responses across different inputs, particularly in high-stakes applications requiring factual accuracy.