OpenAI just introduced Daybreak, a new initiative specifically designed to hunt down and patch software vulnerabilities before malicious actors can exploit them. If it sounds similar to you, it’s because it’s OpenAI’s direct response to Anthropic’s Claude Mythos-powered Project Glasswing.
OpenAI’s new Daybreak AI cybersecurity initiative
Beyond just a single chatbot, Project Glasswing is a sophisticated AI toolkit. According to OpenAI, the program combines its most advanced models—including the newly rolled out GPT-5.5-Cyber—with its specialized Codex Security agent.
Unlike traditional security scans that simply find bugs, Daybreak aims to automate the entire process. It identifies high-risk attack paths, validates the vulnerabilities, and generates patches that are “audit-ready” for developers. The goal is to turn a process that normally takes weeks of manual analysis into something that happens in mere minutes.
The Anthropic connection
OpenAI’s launch comes on the heels of impressive results from its rival, Anthropic. Their security model, Claude Mythos, recently helped Mozilla find and fix over 270 vulnerabilities in the Firefox browser.
However, Anthropic is also dealing with a security headache of its own. A small group of unauthorized users reportedly managed to gain “preview access” to Mythos through a third-party vendor. There is no evidence about use of the model for hacking yet. Still, the alleged incident highlights why companies like Anthropic and OpenAI are hesitant to release them to the general public.
A controlled rollout
Because of the “dual-use” nature of this technology—it can be used to fix code just as easily as it can be used to break it—OpenAI is keeping a tight grip on the reins. Access to GPT-5.5-Cyber is currently limited to a vetted group of “trusted defenders” responsible for critical infrastructure. These users must undergo strict approval processes and implement advanced security measures by June 1.
“There’s an ongoing tension between the need to move quickly to stay ahead of adversaries and the need to be prudent enough to prevent misuse,” said Katrina Mulligan, head of national security partnerships at OpenAI, at a recent expo.
There are partners like Cloudflare, Cisco, and Palo Alto Networks already on board. Daybreak represents a shift toward “proactive” defense. Instead of waiting for a hack to happen, the industry is betting on AI to harden our digital walls from the inside out.
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