OpenAI Launches Cyber-Permissive GPT Model for Security Pros

OpenAI has launched GPT-5.4-Cyber, a fine-tuned model designed for defensive cybersecurity work, alongside a major expansion of its Trusted Access for Cyber program to thousands of verified security professionals. The model lowers refusal boundaries for legitimate security tasks and adds capabilities like binary reverse engineering, unavailable in the standard GPT-5.4. Access is restricted to vetted users through tiered verification levels at chatgpt.com/cyber. OpenAI also reported its Codex Security product has helped fix over 3,000 critical vulnerabilities, and capture-the-flag benchmark scores jumped from 27% to 76% across recent models.