OpenAI Expands Daybreak With GPT-5.5-Cyber to Help Defenders Patch Security Flaws

OpenAI is releasing an enhanced version of its GPT-5.5-Cyber model to select defenders as part of the Daybreak initiative. This model is considered the company's most capable yet for identifying and assisting in the patching of software vulnerabilities. The GPT-5.5-Cyber model can perform more in-depth analysis across extensive codebases. OpenAI announced the Daybreak initiative last month, and this release is an expansion of that effort. The model is intended to aid defenders in addressing security flaws. OpenAI describes GPT-5.5-Cyber as its strongest model for this purpose.