GPT-5.5-Cyber

GPT-5.5-Cyber is OpenAI's specialized AI model designed to enhance cybersecurity capabilities by automating vulnerability detection and remediation. Announced as part of OpenAI's Daybreak initiative, the model is intended to help organizations identify, validate, and patch software vulnerabilities at scale. According to OpenAI, GPT-5.5-Cyber outperforms Anthropic's competing Mythos model on cybersecurity benchmarks, positioning it as a significant tool for defenders.

The model operates within a broader ecosystem of cybersecurity tools launched by OpenAI. The company introduced "Patch the Planet," a program focused on discovering and fixing vulnerabilities in open-source software that underpins much of the internet. OpenAI has also partnered with IBM to integrate frontier AI capabilities into enterprise cybersecurity workflows. These initiatives emphasize AI-driven defense—helping organizations strengthen their security posture against evolving cyber threats.