Frontier AI is moving faster than traditional cyber defenses while access to models such as Mythos and Fable can change without warning. In this episode of the AI Proving Ground Podcast, WWT's Chief National Security and Critical Infrastructure Advisor Madison Horn and Field CTO Robert Geis explain why security leaders must look beyond any single model and answer three urgent questions: How do we defend at machine speed? Which tools can we trust? And who is accountable when a critical dependency changes or disappears?