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 chatExpress AI is a multi-model AI chat platform built by ExpressVPN and accessible at app.expressai.com. At launch, it offers access to five general-purpose AI models, each selected for a different task type. What separates it from platforms like ChatGPT or Claude isn't the model lineup, but the underlying architecture: every interaction runs inside a confidential computing environment where encryption keys are generated inside the hardware itself, mathematically isolating conversations from cloud providers, model operators, and ExpressVPN. The platform targets professionals and individuals who r
Express AI reviewThe 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… 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 . …
… Closing the governance gap The practical response is to treat AI-driven risk discovery as more than a security workflow. Security teams need the capability to detect, validate and investigate weaknesses, but governance determines what happens after that. …
Everything old is new again. Several years ago cybersecurity teams across the world, ranging from the NSA down to small fintech startups, were faced by a novel threat that seemed straight out of science fiction. …
… Privacy claims in the AI space are easy to make and hard to verify, which is why ExpressVPN commissioned an independent audit from Cure53, a German cybersecurity firm known for rigorous assessments. …