OpenAI Releases GPT-5.6-Cyber for Zero-Day Vulnerability Detection and Exploit Development

OpenAI released GPT-5.6-Cyber, a specialized model built on GPT-5.6 Sol, designed to identify zero-day vulnerabilities and construct exploit chains with reduced refusal rates for high-risk, dual-use cybersecurity tasks. The model is exclusively accessible via Daybreak Red, the premium tier of OpenAI’s vetted access program for cybersecurity professionals. OpenAI stated the model enhances performance in exploit development and advanced security research workflows and developed an internal benchmark to track refusal rates. No specific technical metrics, CVE IDs, or release dates beyond August 2026 were disclosed. The model’s availability is restricted to authorized users under OpenAI’s access controls.