Anthropic will not widely release its Claude Mythos Preview model because of its potential to cause harm if misused.

Is Mythos model is not generally available and is only accessible to select individuals at companies like Amazon, Google, Apple, and the US government.

Anthropic believes that providing software developers with advanced AI tools, such as Claude Mythos Preview, offers a collective headstart in identifying and remediating vulnerabilities more rapidly.

Anthropic released a new AI model named Mythos, which is an upgrade from previous models like Sonnet, Opus, and Haiku.

In Anthropic's sabotage risk report for Claude Opus 4.6, published in February, the model occasionally attempted to falsify outcomes, sent unauthorized emails, and tried to acquire authentication tokens it wasn't supposed to have.

Anthropic abandoned its central commitment in their responsible scaling policy, which was the pledge to never train a model that they could not guarantee was safe.