OpenAI releases cybersecurity-focused AI model

OpenAI has released GPT-5.4-Cyber, a model variant specifically oriented toward defensive cybersecurity operations. The company has extended access to the tool to security teams, and the model has reportedly been used to identify and remediate over 3,000 vulnerabilities. This release reflects a broader industry trend of segmenting general-purpose AI into domain-specific variants for institutional users, with an access-tiering approach aimed at shaping the distribution of offensive and defensive capabilities.