The advent of Claude Mythos combined with the release of OpenAI’s GPT-5.5 have changed the threat model for CISOs.
The arrival of those frontier AI models — and the ones soon to follow — makes it much easier to discover and chain vulnerabilities at a speed and scale that will require most cyber departments to rethink their strategies and operations.
Experts polled by CSO on the impact of these capabilities say defenders should assume AI will make initial compromise more likely and that they should focus less on trying to patch everything perfectly and more on limiting blast radius through stronger identity controls, least privilege, and internal segmentation.
Wild frontier
Although access to...