Anthropic’s Mythos AI Model Reportedly Accessed by Unauthorized Users as Bank Rollout Expands
Apr 22, 2026
Anthropic’s new Mythos AI model has reportedly been accessed by a small group of unauthorized users, according to Bloomberg News, which cited documentation and a person familiar with the matter. The company has said Mythos is powerful enough to help enable dangerous cyberattacks.
The report comes as Anthropic is also preparing to expand access to Mythos for European banks soon, after some large U.S. banks had already received initial access. The model has drawn attention from the cybersecurity and banking sectors because of its focus on cyber-related use cases.
What is Mythos?
Mythos is Anthropic’s new AI model focused on cybersecurity-related tasks.
Why is the report about unauthorized access important?
Anthropic says the model is powerful enough to help enable dangerous cyberattacks, so unauthorized access raises security concerns.
Who has been given access to Mythos so far?
Some large U.S. banks have already had initial access, and Anthropic plans to give access to European banks soon.
Did Anthropic comment on the unauthorized access report?
The source text does not include a direct statement from Anthropic on the report.
Sources
Anthropic plans to provide Mythos access to European banks soon, sources say
Reuters
Reuters
Anthropic plans to provide access to its Mythos AI model to European banks soon, three people familiar with the matter said, as global banks scramble to test the technology after large U.S. banks were given initial access.
Sam Altman throws shade at Anthropic's cyber model, Mythos: ‘fear-based marketin...
TechCrunch
TechCrunch
OpenAI and Anthropic continue to take swipes at each other. This week, during a podcast appearance, OpenAI CEO Sam Altman called out his competitor's new cybersecurity model, noting that the company was using fear to make its product sound more impressive than it actually is.
Anthropic's Mythos model accessed by unauthorized users, Bloomberg News reports
Reuters
Reuters
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.
Anthropic's Mythos AI Model Accessed by Unauthorized Users
Bloomberg Markets and Finance
Bloomberg Markets and Finance
A small group of unauthorized users have accessed Anthropic PBC's new Mythos AI model, a technology that the company says is so powerful it can enable dangerous cyberattacks, according to a person familiar with the matter and documentation viewed by Bloomberg News. Michael Shepard has more on "Balan...
Anthropic's Mythos model reportedly accessed by unauthorized users
CNBC Television
CNBC Television
CNBC's Kate Rooney joins 'Fast Money' with a developing story out of Silicon Valley.
Unauthorized group has gained access to Anthropic's exclusive cyber tool Mythos,...
TechCrunch
TechCrunch
A group of unauthorized users has reportedly gained access to Mythos, the cybersecurity tool recently announced by Anthropic.
Anthropic's Mythos Accessed by Unauthorized Users
Bloomberg Markets and Finance
Bloomberg Markets and Finance
A small group of unauthorized users have accessed Anthropic's new Mythos AI model, a technology that the company says is so powerful it can enable dangerous cyberattacks, according to a person familiar with the matter and documentation viewed by Bloomberg News. Bloomberg Intelligence's Matt Bloxham...
Australia and New Zealand central banks monitoring Anthropic's Mythos release
Reuters
Reuters
The central banks of Australia and New Zealand said on Wednesday they were monitoring the release of Anthropic's advanced Mythos artificial intelligence model, joining authorities around the world in expressing concerns about the new cybersecurity risks it poses.
Sam Altman compares Anthropic's Mythos to dropping a bomb while selling a $100 b...
Business Insider
Business Insider
OpenAI CEO Sam Altman said Anthropic is using "fear-based marketing" to sell Claude Mythos. Anthropic said it would not release Claude Mythos publicly due to its cybersecurity capabilities.
Anthropic investigates report of rogue access to hack-enabling Mythos AI
The Guardian
The Guardian
‘Handful' of people allegedly gain unauthorised access to model adept at detecting cybersecurity vulnerabilities
Why Anthropic's Mythos AI has regulators, central banks on edge
Invezz
Invezz
Financial regulators across major economies are stepping up scrutiny of a powerful new artificial intelligence model developed by Anthropic, amid growing concerns that its advanced capabilities could expose vulnerabilities in critical financial and digital systems. Authorities in Japan, Europe, Indi...
Uninvited Users Access Anthropic's Mythos AI Model
PYMNTS
PYMNTS
Anthropic's Mythos AI model has reportedly been accessed by unauthorized users. That's according to a report Wednesday (April 22) by Bloomberg News, which notes that the company has described Mythos as powerful enough to initiate serious cyberattacks.
Anthropic Probes Possible Unauthorized Access to Mythos AI Model
WSJ
WSJ
The incident could complicate efforts to keep a tight lid on a tool that has spooked the White House and businesses.
Anthropic's Mythos model accessed by unauthorized users: Report
CNBC Television
CNBC Television
CNBC's MacKenzie Sigalos reports on news that Anthropic's Mythos has been the subject of a cybersecurity breach.
Anthropic's New Mythos A.I. Model Sets Off Global Alarms
NYTimes
NYTimes
Mythos has triggered emergency responses from central banks and intelligence agencies globally, as Anthropic decides who has access to the powerful model.
Anthropic's Mythos Accessed by Unauthorized Users
Bloomberg Technology
Bloomberg Technology
A small group of unauthorized users have accessed Anthropic PBC's new Mythos AI model, which the company says can enable dangerous cyberattacks. -------- Like this video?
Outsiders breached Anthropic's Claude Mythos same day ‘potentially dangerous' AI...
New York Post
New York Post
The unauthorized users belong to a private online forum dedicated to cracking unreleased AI models.
Microsoft to integrate Anthropic's Mythos into its security development program
Reuters
Reuters
Microsoft said on Wednesday it plans to embed advanced artificial intelligence models, including Anthropic's Claude Mythos Preview, into its secure coding framework, as the company steps up its cybersecurity capabilities.
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