Svmuu News: OpenAI announced an upgrade to its Daybreak cyber defense toolchain and officially launched the full version of the GPT-5.5-Cyber model for cybersecurity defense scenarios.
In the CyberGym benchmark—which evaluates AI agents’ ability to reproduce known vulnerabilities—GPT-5.5-Cyber achieved a single-model score of 85.6%, surpassing GPT-5.5’s 81.8% and Anthropic Mythos 5’s 83.8%.
OpenAI stated that as AI significantly improves vulnerability discovery efficiency, the core bottleneck in cybersecurity is shifting from “discovering vulnerabilities” to “automatically patching them.” To address this, the company has simultaneously upgraded the Codex Security plugin to enable developers to automatically analyze vulnerabilities and generate patches within the Codex environment. Since the release of its preview version in March of this year, Codex Security has scanned over 30 million code commits and automatically confirmed fixes for 500,000 security defects. The new version also supports CodeQL query integration and SARIF standard file exports.
In addition, OpenAI has partnered with organizations such as Trail of Bits and HackerOne to launch the “Patch the Planet” open-source security initiative, providing ChatGPT Pro subscriptions and API quotas to more than 30 mainstream open-source projects—including cURL and Go—with a team of security experts manually verifying the quality of the patches. Regarding the Daybreak Partner Program, security vendors such as Palo Alto Networks and Wiz have been among the first to integrate these capabilities.