According to a Bloomberg News report dated Tuesday, April 22, 2026, citing documents and people familiar with the matter, Anthropic’s AI model Claude Mythos Preview was accessed by a small batch of unauthorized users on the same day that Anthropic first publicly announced its plan to open up Mythos testing to a limited number of enterprises.
Bloomberg Report Details: A Small Number of Users Received Access to Claude Mythos Preview
According to Bloomberg’s report, in a private online forum, a small number of users received access to Claude Mythos Preview on the same day Anthropic announced its plan to open Mythos testing to a limited number of businesses; since then, that user group has been using Mythos regularly. However, Bloomberg’s report said that the purpose of use was not for cybersecurity purposes. Bloomberg stated that, in the course of reporting on this investigation, the access party provided screenshots and an on-site demonstration of model use.
An Anthropic spokesperson confirmed that an investigation has been initiated and did not provide further details on the investigation’s progress.
Background on Claude Mythos and Project Glasswing
According to Anthropic’s public materials, Claude Mythos Preview was announced on April 7, 2026 as part of Anthropic’s “Project Glasswing.” Project Glasswing is a controlled program that allows certain organizations to use an unreleased Claude Mythos Preview to perform defensive cybersecurity work. Anthropic previously said that Mythos has unprecedented capabilities to identify digital security vulnerabilities and potential misuse, and that it has drawn the attention of regulators.
Frequently Asked Questions
When did Bloomberg report that Claude Mythos Preview was accessed without authorization?
According to a Bloomberg News report dated Tuesday, April 22, 2026, citing documents and people familiar with the matter, Claude Mythos Preview was accessed without authorization by a small number of users in a private forum on the same day Anthropic announced plans to open testing to limited enterprises.
What official response did Anthropic provide to this incident?
According to an Anthropic spokesperson statement cited by Bloomberg, Anthropic said: “We are investigating a report that claims someone accessed Claude Mythos Preview without authorization through an environment provided by one of our third-party vendors.”
Which program does Claude Mythos Preview belong to, and what is it designed for?
According to Anthropic’s public materials, Claude Mythos Preview was announced on April 7, 2026 and belongs to the “Project Glasswing” program, which allows certain organizations to use an unreleased model for defensive cybersecurity work.
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