Frontier models have made it easier than ever to prototype AI capabilities in-house, but building a working prototype and operating a secure, reliable cyber defense capability are two very different things. This infographic compares building on frontier models with buying purpose-built cyber AI across speed, security, expertise, reliability, and long-term ownership. It also shows the hidden 80% of work behind enterprise-grade AI and makes the case that build vs. buy is a false binary. Experiment where speed and customization matter, and rely on purpose-built technology where the stakes are too high to get wrong.