Key Findings OpenAI unveiled GPT-5.4-Cyber, a cybersecurity-focused variant of its flagship GPT-5.4 model optimized for defensive security operations The company is expanding its Trusted Access for Cyber (TAC) program to thousands of individual defenders and hundreds of security teams GPT-5.4-Cyber has already contributed to over 3,000 critical and high-severity vulnerability fixes through the Codex Security application Access will be controlled through Know-Your-Customer ver
