OpenAI has launched GPT-5.6-Cyber, a specialized AI model for advanced vulnerability research and exploit development. This model is a fine-tuned version of GPT-5.6 Sol, specifically trained for cybersecurity tasks like finding zero-day vulnerabilities. Crucially, it's engineered to reduce refusals on potentially dual-use cybersecurity requests, aiming to assist defenders. GPT-5.6-Cyber demonstrated significantly higher completion rates on advanced cybersecurity benchmarks compared to its predecessors and the general GPT-5.6 Sol model. However, access to GPT-5.6-Cyber is restricted to organizations accepted into OpenAI's new Daybreak Red cybersecurity program. Daybreak Red requires a rigorous application process, including demonstrating a strong internal security program and lawful, authorized defensive work. A broader tier, Daybreak Blue, offers some lifted guardrails on general models like GPT-5.6 Sol for a wider range of defenders. OpenAI has already reported GPT-5.6-Cyber's success in discovering multiple zero-day vulnerabilities in systems like Google's V8 JavaScript engine. While specialized, GPT-5.6-Cyber does not universally outperform general models on all cybersecurity tasks. The launch of these more permissive models occurs after a significant AI-driven cyber incident involving OpenAI and Hugging Face, highlighting the delicate balance between capability and safety.