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 chatThe Associated Press dug deeper, and was informed by an unidentified US official that Mythos merely found vulnerabilities within hours, not necessarily exploited them. Still, identifying a vulnerability that theoretically can be exploited for attacks against protected US Government systems should be cause for concern on its own. Mythos is an advanced AI model built by Anthropic, first introduced in early April this year. However, the company decided not to share it with the general public because it was apparently too capable of discovering and leveraging software vulnerabilities. Instead, Ant
Vulnerabilities uncovered in secret US government systems and software during testing of Anthropic Mythos… In the interval between this attack and the Mythos Preview announcements, models such as GPT-5.3-Codex and Opus 4.6 already made measurable progress beyond 2025 models on Multi-Step Cyber Attacks. Is Anthropic’s decision to withhold Mythos Preview a marketing stunt? …
Access to Mythos 5 and Fable 5 has been pulled by Anthropic The move is after a directive from the US government A potential jailbreak is likely the reason for the change in access Under orders from the US government, Anthropic is pulling access to its latest Mythos 5 and Fable 5 AI models . …
… The emergence of Anthropic's Claude Mythos model has put a new item on the agenda of everyone who runs business-critical technology. …
Senator Mark Warner testified NSA confirmed Mythos Preview identified vulnerabilities in nearly all classified systems within hours during a controlled exercise US officials clarified Mythos found flaws rapidly rather than exploiting them, but the capability still raises major concern Anthropic wit… …
… The Mythos warning Anthropic’s Mythos model is a perfect case in point here. …
… Majority Move M4 review: price & release date Priced at £119.95 about $160 / AU$225 Released in January 2026 The Majority Move M4 released in January 2026 in the UK, although at the time of writing, the speaker — alongside its sibling models, including the Move M1, M2, and M3 — are yet to land in t… …
… The Makr Pro, however, is a single model and a single model only. …
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