OpenAI's New Daybreak Platform Uses GPT-5.5 to Find Software Vulnerabilities

OpenAI launched Daybreak, a cyber defense platform aimed at helping companies find, investigate, and fix software vulnerabilities.

Daybreak uses GPT-5.5 variants and Codex Security to build editable threat models from code repositories and support isolated analysis.

The platform is positioned as a response to Anthropic’s Glasswing and offers tiered access for defensive cybersecurity workflows.

The move expands OpenAI’s enterprise security tooling and could automate more vulnerability discovery and remediation during development.