When is it better to use rule-based QA instead of LLM-based QA?

Rule-based QA systems are often superior when absolute precision and determinism are non-negotiable, particularly in domains where factual accuracy is paramount. This includes scenarios with highly structured and static knowledge bases, such as internal company policies, regulatory compliance documents, or specific product specifications. They excel when explainability and auditability are critical, allowing developers to trace exactly how an answer was derived, unlike the opaque nature of many LLM outputs. Furthermore, for simpler, well-defined question sets, rule-based systems can be significantly more cost-effective and resource-efficient than deploying and maintaining complex LLM infrastructure. They also mitigate the risk of hallucinations or irrelevant information, ensuring every response adheres strictly to the programmed rules and available data, making them ideal for sensitive or compliance-heavy environments. More details: https://maturosexy.com/tt/o.php?s=55&u=https://infoguide.com.ua