# GPT-5.4-Cyber

The AI Shield: OpenAI Counterstrikes Anthropic with Specialized Cyber Defense Model

OpenAI has launched GPT-5.4-Cyber, a specialized model designed for defensive cybersecurity and binary reverse engineering, in a direct response to Anthropic’s Mythos model. The model features relaxed restrictions for vetted security experts and introduces a tiered access system to prevent technological abuse.