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AII-1000-91587
ReportedReported by fewer than three independent publishers, with no official finding.Supporting sources are pending verification.

Anthropic Releases Claude Model with Cybersecurity Restrictions

Anthropic released a restricted version of its Mathos AI model as Claude Sonnet 5, prohibiting use in cybersecurity and biotechnology after an earlier version discovered decades-old vulnerabilities in common software. The company implemented safeguards and provided select government agencies and companies early access through a program called Glass Wing to help secure their systems.

15 June 2026 Β· Anthropic Β· Security and cyberattacks
15 June 2026
AII-1000-91587
Quick facts
Category
Security and cyberattacks
Country
United States
Date
15 June 2026
Drafted by
Raidu Incident Detection

What happened

Anthropic released a public version of its Mathos model called Claude Sonnet 5, with restrictions preventing use for cybersecurity and biotechnology applications.

Months earlier, the Mathos Preview model discovered security vulnerabilities that had remained hidden for decades in widely-used software, raising concerns about AI being used to find vulnerabilities and conduct destructive cyberattacks.

Reported impact

The discovery of hidden security vulnerabilities in established software created concerns about potential misuse of AI to identify and exploit system flaws.

Index analysis

Anthropic implemented safeguards and protective controls against potential dangerous uses of the Claude Sonnet 5 model and subjected them to intensive testing.

Governance controls

Selected government agencies and companies were granted access to Mathos Preview to secure their systems against potential attacks through a program called Glass Wing.

The public Claude Sonnet 5 release includes restrictions on cybersecurity and biotechnology applications to mitigate misuse risks.

Classification

Category
Security and cyberattacks
Industry
Government, security and defence
Country
United States
Harm status
Potential harm
Intent
Unintentional
Timing
Post-deployment
AI systems
Claude Sonnet 5, Mathos Preview

Sources and evidence

Sources not yet published

This record was researched and written by the Index from original reporting. Its sources are still being verified by an editor, and they are listed here once that check is complete. Until then the record carries no reviewer.

How sources are verifiedSuggest a source for this incident