OpenAI expands its cyber defense program with GPT-5.4-Cyber for vetted researchers - Help Net Security

OpenAI is expanding its Trusted Access for Cyber (TAC) program to provide thousands of verified individual defenders and hundreds of teams with prioritized access to AI tools for cybersecurity. This expansion includes the release of GPT-5.4-Cyber, a version of GPT-5.4 fine-tuned for defensive cybersecurity tasks, featuring a lower refusal boundary and capabilities like binary reverse engineering for analyzing software without source code. The TAC program, initially launched in February 2026, now offers additional access tiers for authenticated cybersecurity defenders, with the highest tiers granting access to GPT-5.4-Cyber. Access is granted through identity verification on chatgpt.com/cyber for individuals or via an OpenAI representative for enterprises. The program operates on principles of democratized access, iterative deployment, and ecosystem resilience, aiming to provide legitimate actors with advanced capabilities while managing dual-use risks through strong verification and visibility. OpenAI's Codex Security tool has also contributed to fixing thousands of vulnerabilities and scanning open-source projects.

(Source：Help Net Security)