Cloudflare · Anthropic · OpenAI · Oracle · Mythos · Codex · Engadget
OpenAI has debuted Daybreak, a cybersecurity initiative that's clearly the firm's competitor to Anthropic's Project Glasswing
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◎ Multiple-sources
It's been promising, so far: Mozilla revealed in April that Mythos helped it find and patch 271 vulnerabilities in the latest release of the Firefox browser.
Key facts
- Daybreak will use GPT-5.5 for general purposes and GPT-5.5 with Trusted Access for Cyber for most defensive security workflows, including "secure code review, vulnerability triage, malware analysis
- It will also rely on GPT-5.5-Cyber for "preview access for specialized workflows, including authorized red teaming, penetration testing and controlled validation
- OpenAI has launched Daybreak, a cybersecurity initiative that's clearly the company's competitor to Anthropic's Project Glasswing
- It's been promising, so far: Mozilla revealed in April that Mythos helped it find and patch 271 vulnerabilities in the latest release of the Firefox browser
Summary
OpenAI has launched Daybreak, a cybersecurity initiative that's clearly the company's competitor to Anthropic's Project Glasswing. In its announcement, the company explained that Daybreak is built around the premise that cyber defense should be built into software from the start and not revolve around finding and fixing vulnerabilities. Find and fix vulnerabilities earlier with Daybreak pic.twitter.com/yobOSWYeWP. — OpenAI May 11, 2026. Daybreak will use GPT-5.5 for general purposes and GPT-5.5 with Trusted Access for Cyber for most defensive security workflows, including "secure code review, vulnerability triage, malware analysis, detection engineering and patch validation. " It will also rely on GPT-5.5-Cyber for "preview access for specialized workflows, including authorized red teaming, penetration testing and controlled validation.