OpenAI's GPT-5.

GPT-5.5-Cyber scored 85.6% on the CyberGym benchmark, surpassing Anthropic's Mythos 5 (83.8%) and Claude Opus 4.7 (73.1%). Anthropic's Mythos models were pulled offline on June 12 under a Trump administration export ban, while OpenAI's model remains available to vetted defenders.

Featured · Dario Amodei