Come vulnerabilities were found within hours, but that does not mean the model was able to exploit them within that time, the official said.

The post Anthropic’s Mythos Model Found Vulnerabilities in Classified US Government Systems, Official Says appeared first on SecurityWeek.

Anthropic takes Fable 5 and Mythos 5 offline to comply with a directive from the Trump administration to prevent use by foreign nationals.

The post Anthropic Says It Has Taken Its Latest AI Models Offline to Comply With New Export Controls appeared first on SecurityWeek.

The AI giant also announced that Project Glasswing partners are being given access to the upgraded Mythos 5.

The post Anthropic Launches Claude Fable 5: Mythos-Class AI With Cybersecurity Guardrails  appeared first on SecurityWeek.

Public LLM models with safeguards turned off can also build working exploits, increasing patch gap risks.

The post Claude Mythos Turns N-Days Into N-Hours With Rapid Exploit Creation appeared first on SecurityWeek.

Only approximately 50 companies have had access to Mythos until now and they have found thousands of vulnerabilities in their products.

The post Anthropic Expanding Mythos Access to 150 New Organizations appeared first on SecurityWeek.

Many findings have been confirmed to be critical or high-severity vulnerabilities and the number will continue to increase. 

The post Anthropic: Mythos Detected 23,000 Potential Vulnerabilities Across 1,000 OSS Projects appeared first on SecurityWeek.

Independent benchmarking finds Mythos highly effective for source code audits, reverse engineering, and native-code analysis, though its exploit validation and reasoning capabilities remain inconsistent.

The post Mythos Proves Potent in Vulnerability Discovery, Less Convincing Elsewhere appeared first on SecurityWeek.

New “Sweet Attack” platform uses runtime intelligence and continuous agentic red teaming to identify exploitable attack chains human teams may miss.

The post Sweet Security Launches Agentic AI Red Teaming to Counter ‘Mythos Moment’ appeared first on SecurityWeek.

With Mythos signaling a new era of near-instant exploitation, Anthropic positions Claude Security to help defenders keep pace.

The post Anthropic Unveils Claude Security to Counter AI-Powered Exploit Surge appeared first on SecurityWeek.

Only with the right platform and an agentic, AI-driven defense, will enterprises be able to protect themselves in the agentic era.

The post The Mythos Moment: Enterprises Must Fight Agents with Agents appeared first on SecurityWeek.

360 Digital Security Group claims to have uncovered 1,000 vulnerabilities using AI, including at the Tianfu Cup hacking contest.

The post Chinese Cybersecurity Firm’s AI Hacking Claims Draw Comparisons to Claude Mythos appeared first on SecurityWeek.

All the flaws could have also been found by an elite human researcher, according to Mozilla.

The post Claude Mythos Finds 271 Firefox Vulnerabilities appeared first on SecurityWeek.

GPT‑5.4‑Cyber is a model fine-tuned for defenders, lowering boundaries for legitimate cybersecurity work.

The post OpenAI Widens Access to Cybersecurity Model After Anthropic’s Mythos Reveal appeared first on SecurityWeek.