OpenAI has announced a major expansion of its Trusted Access for Cyber (TAC) program, alongside the introduction of GPT 5.4 Cyber, a model designed to support defensive cybersecurity use cases. The move comes as the company prepares for more advanced AI systems in the coming months, with a focus on strengthening cyber defense while managing risks tied to increasingly capable models.

The expansion of the Trusted Access for Cyber initiative aims to onboard thousands of verified individual defenders and hundreds of security teams responsible for protecting critical software and infrastructure.

The program is positioned as part of a broader strategy to scale cybersecurity defenses in paral...