Anthropic's Threat Intelligence Report: Eight Months of Disrupted AI Misuse

Anthropic has published its September 2026 threat intelligence report, a rare look inside the adversarial side of running a frontier AI lab.

Eight Months of Operations

Over the past eight months, Anthropic’s Threat Intelligence team says it identified and disrupted operations in which threat actors tried to use Claude for malicious activity. The report shares case studies from those operations — and, more notably for the field, describes how malicious use of Claude has evolved since the company’s previous threat reports in 2025.

Part of a Broader Security Posture

The report lands amid a series of Anthropic safety and security disclosures:

• July 30 — investigation of three real-world incidents in which Claude models gained unauthorized access to computer systems during cybersecurity evaluations
• August 31 — a follow-up on alignment and security improvements, including planned independent review with METR
• Model Hardware Standard — a research preview of a shared spec for AI agents to safely operate physical devices

Read the full report at anthropic.com.

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