AI Glossary
Safety classifier
Also called content moderation model
What does “Safety classifier” mean?
Safety classifier: Separate model that screens prompts or responses and flags or blocks content in categories like violence, self-harm, hate or weapons instructions. It acts as a guardrail running alongside the main model, so a harmful output can be caught even if the main model was tricked. Classifiers must balance missed harms against blocking harmless requests.

What is an example of “Safety classifier”?
A chat app might run every reply through a safety classifier and replace flagged responses with a refusal message before the user sees them.