[gpt-5.5-cyber]

June 24, 2026

• OpenAI expanded its Daybreak initiative with the full GPT-5.5-Cyber model, an updated Codex Security plugin, and a 25+ partner network, claiming it outperforms Anthropic's Mythos on a cybersecurity benchmark and shifting focus from finding to auto-patching vulnerabilities. The Decoder. · AI & Model Security

in Two Netlogon Flaws Hit Domain Controllers as FortiBleed Lands in Finland

June 23, 2026

• OpenAI expands Daybreak with GPT-5.5-Cyber — billed as its "strongest model yet for finding and helping patch software vulnerabilities," released to trusted defenders, claiming sustained analysis across large codebases. The Hacker News · AI & Model Security

in Five Eyes Warns Frontier AI Will Reshape Offensive Cyber Ops as a New Entra ID Conditional Access Bypass Surfaces