GPT-5.6-Cyber

OpenAI's cybersecurity-specialized model, launched Aug 10 2026 as the successor to the limited-preview GPT-5.5-Cyber. Built on GPT-5.6-Sol and tuned for authorized security workflows — vulnerability discovery, exploit-chain development, privilege escalation, authentication-bypass analysis, patch validation, and red-teaming — with a deliberately lower refusal rate on dual-use security tasks than general GPT-5.6. OpenAI reports a 95% completion rate on advanced exploit-chain prompts (vs ~1.5% for GPT-5.6-Sol) and that the model surfaced a high-severity V8 JavaScript-engine vulnerability plus flaws in unnamed mobile-OS, database, and kernel targets. Not generally available: access is gated to vetted defenders through the expanded Daybreak program's new "Daybreak Red" tier (partners include Accenture, IBM, Palo Alto Networks, CrowdStrike, Fortinet, Akamai, and Cloudflare). Size undisclosed; weights not released.