Frontier AI for cyber defenders.
Safer software, resilient by design
OpenAI Daybreak is our vision to change the way software is built and defended.
Daybreak is the first glimpse of sunlight in the morning. For cyber defense, it means seeing risk earlier, acting sooner, and helping make software resilient by design.
It starts from the premise that the next era of cyber defense should be built into software from the beginning by not only finding and patching vulnerabilities, but being resilient to them by design.
AI can now help defenders reason across codebases, identify subtle vulnerabilities, validate fixes, analyze unfamiliar systems, and move from discovery to remediation faster. Because those same capabilities can be misused, Daybreak pairs expanded defensive capability with trust, verification, proportional safeguards, and accountability.
The goal is simple: accelerate cyber defenders and continuously secure software.
Daybreak combines the intelligence of OpenAI models, the extensibility of Codex as an agentic harness, and our partners across the security flywheel to help make the world safer for everyone. Defenders can bring secure code review, threat modeling, patch validation, dependency risk analysis, detection, and remediation guidance into the everyday development loop so software becomes more resilient from the start.
In the coming weeks, we’re working with our industry and government partners as we prepare to deploy increasingly more cyber-capable models as part of our approach to iterative deployment.
How to deploy AI in modern cyber defense
Focus on the threats that matter
Prioritize high-impact issues and reduce hours of analysis to minutes—with more efficient token usage.
Patch safely, at scale
Generate and test patches directly in your repositories, with scoped access, monitoring, and review.
Verify every fix
Send results and audit-ready evidence back to your systems to track and verify remediation.
Deploy frontier cyber intelligence inside Codex Security
Choose the right level of access
Contact the OpenAI team to align on the best model for your security workflows.
Access | What changes | Intended use cases |
GPT‑5.5 (default) | Standard safeguards for general-purpose use | General-purpose, developer, and knowledge work |
GPT‑5.5 with Trusted Access for Cyber | More precise safeguards for verified defensive work in authorized environments | Most defensive security workflows, including secure code review, vulnerability triage, malware analysis, detection engineering, and patch validation |
GPT‑5.5‑Cyber | Most permissive behavior for specialized authorized workflows, paired with stronger verification and account-level controls | Preview access for specialized workflows, including authorized red teaming, penetration testing, and controlled validation |
Trusted by leading security organizations
“We’re excited about the potential of OpenAI’s cyber capabilities to bring stronger reasoning and more agentic execution into security workflows. It’s a big step forward for teams to be able to leverage frontier models not only to accelerate velocity, but also to improve their security posture.”
