OpenAI's GPT-5.5-Cyber autonomously patches zero-day exploits

OpenAI has released GPT-5.5-Cyber, a specialized AI model designed for autonomous cybersecurity defense. This model, part of OpenAI's Daybreak initiative, can reportedly detect zero-day vulnerabilities like "Cerberus's Grin" and autonomously generate, test, and deploy patches within minutes. While this automation offers unprecedented speed in threat neutralization, it also raises concerns about AI oversight and the potential for catastrophic errors. AI

IMPACT Accelerates enterprise adoption of AI for autonomous cybersecurity defense.

RANK_REASON Frontier-lab model release with system card. [lever_c_demoted from frontier_release: ic=1 ai=1.0]

Read on dev.to — LLM tag →

• Cerberus's Grin
• Daybreak
• GPT-5.5-Cyber
• OpenAI

• model release
• product

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