OpenAI Launches GPT-5.4-Cyber with Reverse Engineering and Malware Analysis Features

OpenAI announced GPT-5.4-Cyber, a specialized variant of its GPT-5.4 model tailored for defensive cybersecurity use, and expanded its Trusted Access for Cyber (TAC) program to provide vetted security professionals with broader capabilities for tasks like binary reverse engineering, automated vulnerability discovery, and malware analysis. The initiative emphasizes access controls (KYC and tiered verification) and reduced refusal boundaries for legitimate defenders, positioning the model as a tool to help defensive teams stay ahead of AI-enabled threats rather than a public-facing release.