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

OpenAI announced GPT-5.5-Cyber—an AI model and updated Codex Security plugin integrated into developer workflows—to accelerate large-scale vulnerability discovery, validation, and codebase-specific patch generation, and launched the "Patch the Planet" program with Trail of Bits to prioritize remediation of critical open-source infrastructure; the report highlights capability improvements and examples of vulnerabilities identified but does not describe any active exploit or breach.