AI models deliver impressive predictions but without the right accuracy metrics, these predictions lack actionable insights. Selecting appropriate accuracy metrics transforms raw outputs into meaningful information, allowing you to fine-tune performance to meet specific goals. Traditional measures like precision and recall are essential for evaluating a model's effectiveness, especially in tasks with balanced classes where accuracy provides clear indications of its ability to assign correct labels consistently. Precision focuses on the accuracy of positive predictions, calculating the proportion of true positives among all positive predictions, while recall evaluates a model's ability to correctly identify actual positive cases within a dataset. The F1 Score combines precision and recall into a single comprehensive measure of performance, especially useful in imbalanced classes where traditional metrics may be misleading. Advanced metrics like AUC-ROC assess the model's discriminative power across various thresholds, Mean Absolute Error measures the average magnitude of errors in predictions without considering direction, Root Mean Squared Error penalizes larger errors more heavily, and BERTScore evaluates semantic similarity between generated sentences and references using transformer-based models. To measure accuracy in modern AI models, practitioners need robust frameworks and AI model validation techniques that can handle non-deterministic responses and semantic understanding while maintaining reliable performance benchmarks.