The AI model that Anthropic billed as too dangerous to release has reportedly been accessed by an unauthorized third party, and the incident raises concerns about the future of cybersecurity. The Mythos model was reportedly accessed by a handful of users in a private Discord chat on the day it was announced publicly, Bloomberg reported. Earlier this month, the group was able to access the program in part because one of the members of the group is a third party contractor for Anthropic, according to Bloomberg. Using this access, the group was able to guess where the model was located based on previously leaked knowledge by another group about Anthropic’s past practices, that hackers obtained from AI training startup Mercor. Although the group that accessed it has not been using the model for cyberattacks, it has been using the program continuously since its release and still has access, the outlet reported. Anthropic did not immediately respond to Fortune’s request for comment. A spokesperson from Anthropic told Bloomberg the company was “investigating a report claiming unauthorized access to Claude Mythos Preview through one of our third-party vendor environments.” The fact that the model was leaked so quickly doesn’t surprise David Lindner, the chief information security officer at Contrast Security and a 25-year industry veteran. Even though Anthropic intentionally limited the model to a small group of 40 companies—including Microsoft, Apple, and Google— to beef up their security ahead of a wider release, thousands of people likely had access to the program across these companies, which makes a leak nearly inevitable, he said. “It was bound to happen,” Lindner said. “The more they add to this elite group, the more likely it was to get released to someone who shouldn’t probably have access to it.” Anthropic claims its Mythos model is more