OpenAI has released an enhanced GPT-5.5-Cyber model through its Daybreak initiative to assist trusted defenders in identifying, validating, and patching software vulnerabilities across large codebases. Alongside an updated Codex Security plugin, this cybersecurity tool streamlines vulnerability detection, triage, and remediation, while the new Patch the Planet project partners with open-source communities to improve security by collaboratively developing and deploying patches. These efforts address the rapid escalation of vulnerabilities accelerated by AI, aiming to support maintainers in securing critical infrastructure despite increasing exploitation risks from advanced threat actors.
https://thehackernews.com/2026/06/openai-expands-daybreak-with-gpt-55.html