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

Anthropic's Mythos LLM is so capable at computer security tasks that Anthropic did not release it publicly, instead granting access only to critical software makers.

Anthropic's Claude Mythos model is a much bigger, more expensive, slower, but more powerful model compared to Opus.

Anthropic has committed up to $100 million in usage credit for Mythos preview across defensive efforts and $4 million in direct donations to open-source security organizations.

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

Anthropic has been using the Claude Mythos model internally since February 24th, 2026.