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Detecting and countering misuse of AI: September 2026
Over the past eight months, our Threat Intelligence team identified and disrupted operations in which threat actors tried to use Claude for malicious activity. In this report, we share case studies from those operations and describe how malicious use of Claude has evolved since our previous threat reports in 2025.
Improving our alignment and security efforts
On July 30, we reported three incidents in which Claude models gained unauthorized access to real computer systems. We are conducting an in-depth analysis of both incidents, and planning to work with METR for an independent review. In the meantime, we’re sharing some of the changes we’ve made over the past month.
Previewing the Model Hardware Standard
We’re opening a research preview of the Model Hardware Standard (MHS), a shared specification for AI agents to safely operate physical devices, to a first group of scientific research labs and advanced manufacturers.
Introducing Claude Opus 5
Opus 5 is a step change improvement for the Opus tier powering long-running agents while delivering improvements in coding and professional work.
News
- Introducing the Life Sciences Verification Program
- Developing Enterprise Frontier Safeguards with our customers
- Improving our alignment and security efforts
- Previewing the Model Hardware Standard
- Expanding our support for scientists
- Funding better evaluations of AI’s impact on wellbeing
- How Claude’s text watermark works
- Improving Fable 5's biology safeguards
- Mariano-Florentino (Tino) Cuéllar to join Anthropic as Chief Global Affairs Officer
- Investigating three real-world incidents in our cybersecurity evaluations