gpt-5-5

GPT-5.5-Cyber: OpenAI Hands Verified Defenders a Less-Restricted Model

OpenAI rolled out GPT-5.5-Cyber to vetted defenders this week. AISI says the underlying model just topped its hardest cyber benchmarks — and cracked a 12-hour reverse-engineering challenge in 10 minutes.

By Sarah Chen · 6 min · May 8, 2026