Anthropic PBC is investigating a report that unauthorized users accessed Claude Mythos, the next-level artificial intelligence model the company says is powerful enough to enable dangerous cyberattacks.

Tencent Holdings Ltd. revealed a major upgrade to its foundational model, marking the first high-stakes test for China’s most valuable company to assert its place in a frenetic AI race since it recruited a top researcher from OpenAI.

Mythos has triggered emergency responses from central banks and intelligence agencies globally, as Anthropic decides who has access to the powerful model.

By combining the efficiency of a Mixture-of-Experts architecture with the openness of an Apache 2.0 license, OpenAI is providing a way for many enterprises to more easily, cheaply and safely redact PII data.

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This isn't about rejecting large models; it's about having the engineering discipline to use smaller, specialized models everywhere else.

A small group of unauthorized users have accessed Anthropic PBC’s new Mythos AI model, a technology that the company says is so powerful it can enable dangerous cyberattacks, according to a person familiar with the matter and documentation viewed by Bloomberg News.

In a pre-release briefing, Open AI president and cofounder Greg Brockman said that GPT-5.5 is “way more intuitive to use,” and can accomplish “more with less guidance.” Ac