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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… Claude Mythos represents the latest step in a wider trend where AI systems are becoming more autonomous, more deeply embedded in enterprise environments and more capable of executing complex tasks at scale. …
… Mythos Preview is better at finding and exploiting vulnerabilities, capable of finding things where humans wouldn’t look scaling in ways that humans won’t , capable of finding things in code that humans have looked at thousands of times but haven’t identified for decades , produces more accurate vu… …
Mozilla says it has patched over 400 bugs with the help of Anthropic Mythos The tool had to be 'harnessed' to Firefox for the best results Mythos offers a step away from the typical 'unwanted slop' provided by AI fuzzing tools Anthropic’s latest cybersecurity tool Mythos is continuing to make waves… …
BT is the first UK firm to join Anthropic's Project Glasswing High-risk Claude Mythos Preview model is limited to select partners only UK infrastructure set for major security boost – BT already blocks 4m attacks daily BT has become the first UK company to publicly confirm membership of Anthropic’s… …