Model
119d agoGPT-5.5 Matches Claude Mythos In Cyber Attack Tests
GPT-5.5 autonomously solved a full network attack simulation, according to the UK AI Security Institute. It performs nearly as well as Claude Mythos in these security benchmarks. While Anthropic restricts Mythos to a small group, OpenAI has already deployed GPT-5.5 via ChatGPT and its API.
The Signal
This increases the availability of high-capability offensive tools.