Beyond the Allowlist: Open Defensive Tools Challenge Frontier Cyber Models

Frontier AI models like Mythos and GPT-5.5-Cyber remain locked behind restrictive government vetting and allowlists that most organizations won't clear until 2027. Yet publicly available alternatives—Llama Guard 3, CodeLlama Guard, and Cisco AI Defense—already handle 80-85% of defensive security tasks at minimal or zero cost, with no NDAs or access delays. For most engineering teams, waiting for frontier model approval is unnecessary when deployable, audit-ready defenses are available today.