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 chatMythos-based Claude Fable 5 is so powerful, Anthropic mandates data retention for safety monitoring Microsoft is worried about insiders sharing confidential information with Anthropic's model Workers told to use Microsoft alternatives, but third-party partner models still available Microsoft has re… …
… As promised with the Mythos Preview, Anthropic have launched their first newer model with cybersecurity de-training in Opus 4.7. When defenders have access to the fully trained model, this forms a two-prong strategy to advantage defenders. …
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… Security maturity, not model novelty, determines organizational resilience. …