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AII-1000-70743
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Anthropic's Mythos AI given to US and UK intelligence agencies

Anthropic provided access to its Mythos AI model, which can identify security vulnerabilities and exploit code bugs, to US and UK intelligence agencies including the NSA and MI5. The company limited access to about 40 organizations due to the model's advanced capabilities in hacking and programming, and intelligence officials warned financial institutions of heightened cyber attack risks.

18 April 2026 · Anthropic · Security and cyberattacks
18 April 2026
AII-1000-707432 sources ↓
Quick facts
Category
Security and cyberattacks
Country
United States
Source
newsbomb.gr
Date
18 April 2026
Drafted by
Raidu Incident Detection

What happened

Anthropic provided access to its Claude Mythos AI model to US and UK intelligence agencies, including the NSA and MI5. The model can identify security vulnerabilities and discover ways to autonomously exploit them in code spanning decades.

The company restricted access to approximately 40 organizations, companies, and government agencies. Government officials in the US, Canada, and Britain warned banking sector leadership of heightened cyber attack risks posed by the model.

Reported impact

MI5 warned banks of increased cyber attack risk. The banking sector, which relies heavily on legacy technology, is considered particularly vulnerable to such threats.

Anthropic stated the model could be used for mass cyber attacks if it fell into the wrong hands.

Index analysis

The model reportedly discovered thousands of security gaps in operating systems and other software. Anthropic CEO Dario Amodei stated the company had discussed opportunities for cooperation with officials across the US government.

Governance controls

Anthropic decided against broad release of Mythos due to its advanced capabilities in hacking and programming. Access was restricted to a limited list of vetted organizations.

Classification

Category
Security and cyberattacks
Industry
Digital security
Country
United States
Harm status
Potential harm
Intent
Unintentional
Timing
Unknown
Harm types
Public interest, Economic or property
Harmed
Business
AI systems
Claude Mythos

Sources and evidence

This record was researched and written by the Index, based on the following original reporting.

newsbomb.gr
"Παραγωγική" συνάντηση Λευκού Οίκου και Anthropic εν μέσω ανησυχιών για το μοντέλο Mythos
18 April 2026
in.gr
Στα χέρια μυστικών υπηρεσιών το "επικίνδυνο" Mythos της Anthropic | in.gr
20 April 2026