Why Anthropic’s new model has cybersecurity experts rattled The company says it has built its most dangerous model yet. Can its coalition of internet companies fix the internet before others catch up? This is a column about Anthropic and AI. My fiancé works at Anthropic. See my full ethics disclosure here. Two weeks ago, Anthropic accidentally leaked the existence of what the company said was its most powerful artificial intelligence to date: a new model, known as Claude Mythos Preview, that represented “a step change” in AI performance. In particular, according to a blog post that leaked due to human error and a misconfigured content management system, Mythos posed serious new risks to cybersecurity. “It presages an upcoming wave of models that can exploit vulnerabilities in ways that far outpace the efforts of defenders,” the blog post stated. On Tuesday, the wave crashed onto the shore. Anthropic announced Mythos alongside Project Glasswing, an initiative with more than 40 of the world’s biggest tech companies that will see Anthropic grant early access to the model to find and patch vulnerabilities across many of the world’s most important systems. Launch partners in the coalition include Apple, Google, Microsoft, Cisco and Broadcom. They’ll be tasked with scanning and patching their own systems along with the critical open-source systems that modern digital infrastructure depends on. Anthropic is giving participants $100 million in usage credits for Mythos, and donating another $4 million to open-source security efforts. Still, today marks a striking and mostly unsettling moment in the development of AI systems. One of the world’s three frontier labs has now created a model it says is too dangerous to release to the general public. These dangers emerged not from any specialized cyber training but from the same general improvements that every other lab is currently