OpenAI Expands Daybreak with Full GPT-5.5-Cyber Release, Codex Security Plugin, and Patch the Planet
OpenAI
On June 22, 2026, OpenAI expanded its Daybreak cybersecurity platform with the full release of GPT-5.5-Cyber (scoring 85.6% on CyberGym — the highest single-model result to date), a Codex Security plugin for finding and patching vulnerabilities within developer workflows, and 'Patch the Planet' — an open-source initiative co-founded with Trail of Bits. Access to GPT-5.5-Cyber remains restricted to verified defenders. The Cyber Partner Program now includes over 20 vendors including Cisco, CrowdStrike, Palo Alto Networks, and Cloudflare; over 30 open-source projects including cURL, Go, and Python have committed to Patch the Planet.
Why it matters
Daybreak's expansion marks OpenAI's most concrete push into enterprise cybersecurity infrastructure: combining a specialized fine-tuned model, developer tooling, and a coordinated open-source patching program positions AI as a systematic defense layer rather than a point tool.
Importance: 4/5
OpenAI flagship security platform expansion: new SOTA model (85.6% CyberGym), new developer plugin, and coordinated open-source security initiative across 30+ projects