The head start that cyber defenders were promised when Mythos was unveiled last month is disappearing faster than expected.

Mythos achieves 30% autonomous network takeover success in testing, accelerating attack speed and forcing security teams to adopt continuous AI-driven

Restricted access to powerful defensive AI tools like Anthropic’s Mythos leaves some companies, central banks, and nations more vulnerable than others.

The head start that cyber defenders were promised when Mythos was unveiled last month is disappearing faster than expected.

Recent security testing suggests that GPT-5.5. model is nearly as good at finding and exploiting software bugs as Anthropic's Mythos Preview.

OpenAI said GPT-5.5-Cyber, a variation of its latest AI model, is rolling out in a limited preview capacity to vetted cybersecurity teams.