EXPANDING DAYBREAK AS THE CYBER DEFENSE WINDOW NARROWS

Summary from the TLDR InfoSec newsletter

OpenAI has expanded its Daybreak cybersecurity program with two new access tiers, Daybreak Blue and Daybreak Red, alongside the introduction of a specialized model named GPT-5.6-Cyber. By explicitly reducing refusals on high-risk tasks, this purpose-built model achieved a 95% completion rate on advanced exploit-chain benchmarks and recently uncovered critical zero-day vulnerabilities like a Chrome V8 heap sandbox escape (CVE-2026-15903). To mitigate the inherent risks of bypassing standard safety guardrails, OpenAI is restricting access to approved defenders and mandating hardware security keys for all accounts starting September 1.