This paper presents a species-agnostic intelligence evaluation criterion for the development of artificial general intelligence (AGI). We propose a general criterion based on "entity fidelity" that encompasses various intelligent behavioral paradigms (e.g., reinforcement learning, generative models, classification, analogical reasoning, goal-directed decision-making, etc.). This criterion defines intelligence as the ability to generate exemplars of a given concept, given exemplars of the same concept. We formalize this mathematically as ε-concept intelligence, outline an empirical protocol, and discuss implications for evaluation, safety, and generalization.