A small group of unauthorized users has ​accessed Anthropic’s new Mythos AI model, Bloomberg News reported on Tuesday, citing documentation and a person familiar with the matter.

A handful of users in a private online forum ‌gained access to ‌Mythos on the ​same ‌day ⁠that ​Anthropic first ⁠announced a plan to release the model to a limited number of companies for testing purposes, the report said.

The group has been using ⁠Mythos regularly since then, though not ‌for ‌cybersecurity purposes, according to ​the report.

“We’re ‌investigating a report claiming ‌unauthorized access to Claude Mythos Preview through one of our third-party vendor environments,” an Anthropic spokesperson said.

Announced on ‌April 7, Mythos is being deployed as part ⁠of Anthropic’s “Project ⁠Glasswing,” a controlled initiative under which select organizations are permitted to use the unreleased Claude Mythos Preview model for defensive cybersecurity.

Mythos is a powerful AI model that has sparked concerns among regulators about its unprecedented ability to identify digital ​security vulnerabilities ​and potential for misuse.