Withholding a model has been a long-standing lever in Frontier Lab safety plans. Before Mythos Preview and Glasswing, OpenAI launched their Trusted Access for Cyber program for GPT-5.3-Codex (their first model to reach “High” cybersecurity capability). Anthropic have now launched their similar Cyber Verification Program.
Mythos enters the chatThe UK AI Security Institute (AISI) put it best with this summary, “Mythos Preview represents a step up over previous frontier models in a landscape where cyber performance was already rapidly improving”. The AISI recently created an evaluation which tests model capability on a network attack simulation spanning 32 stages of an attack chain (estimated to take a human 20 hours to complete). Mythos Preview is the first model to solve this challenge from start to finish, succeeding on 3 of 10 attempts with a 100 million token budget. AISI expect greater budget would improve results further. Mytho
Mythos enters the chat… Some of the vulnerabilities Mythos managed to identify had been present for 15 to 20 years, and required complex chaining of multiple bugs to result in a full chain compromise of Firefox. …
… A bigger change, called 'search by substring', is coming later and is now in testing in Windows 11's preview builds. …
Security Anthropic illustrates the first months of Mythos Preview, saying it discovered thousands of critical and high-severity bugs. …
… The post-Mythos Preview developments have already begun. As promised with the Mythos Preview, Anthropic have launched their first newer model with cybersecurity de-training in Opus 4.7. …
… From countdown starters to calendar previews, from battery charts to fitness info, I make extensive use of widgets on the home screen of my phone. …
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