Anthropic's September 2026 threat report reveals that Iran-linked threat actors and Houthi rebels used the company's Claude AI models to support military operations against US naval forces in the Middle East, including developing targeting recommendations for US warships and using Claude Code to advance missile guidance and hypersonic weapons programs, according to a Tom's Hardware report.
Anthropic's September 2026 threat report, highlighted by Tom's Hardware, outlines two significant cases of AI misuse by state-linked groups. According to the report, an Iran-linked threat actor used Claude to support military reconnaissance and develop targeting recommendations against US naval forces. The actor combined publicly available ship and aircraft transponder identifiers with commercial satellite imagery and information on US naval movements, and even extracted names of US military personnel from captions of publicly available military photographs. The group also researched vulnerabilities in communications equipment aboard ships, including known flaws in Cobham Sailor VSAT terminals, Cisco communications equipment, and Schneider Electric EcoStruxure systems. Anthropic stated it banned the account, introduced additional detection mechanisms, and shared its findings with government authorities.
A second case involved a Houthi-controlled cell in northern Yemen using Claude Code, Anthropic's coding assistant, to support three weapons programs: a guided rocket with a phone-class flight computer for terminal guidance, a multistage ballistic missile with a range exceeding 2,000 km, and an R2000 missile family including a hypersonic glide vehicle variant. The group used Claude to develop guidance, navigation, and control software; integrate an open-source autopilot; write control and position-estimation code; tune parameters; build firmware; and run flight simulations. Essentially, the group used multiple Claude instances instead of a team of software engineers for coding.
Analysis
Why This Matters
- The report demonstrates how state-linked groups can leverage commercial AI tools for military purposes, potentially lowering the barrier to developing sophisticated weapons and targeting capabilities.
- It raises questions about the effectiveness of AI safety measures and the role of AI companies in preventing misuse, particularly in conflict zones.
- As AI tools become more capable, the potential for adversarial use in military contexts is likely to increase, affecting global security dynamics.
Background
Anthropic's threat reports are part of a broader industry effort to identify and mitigate misuse of AI systems. The September 2026 report is the latest in a series that tracks adversarial abuse of Claude. Previous reports have documented various misuse cases, but this one highlights active military use by Iran-linked actors and Houthi rebels, a development that underscores the growing intersection of AI and warfare. Claude Code is a coding assistant tool that can be used for software development tasks, and its misuse here shows that even non-specialist groups can employ AI for complex engineering projects.
Key Perspectives
Anthropic: The company took action by banning accounts, implementing additional detection mechanisms, and sharing findings with government authorities, positioning itself as a responsible AI provider committed to safety.
Iran-linked actors and Houthi rebels: These groups, according to the report, see value in using AI to enhance military capabilities, whether for reconnaissance, targeting, or weapons development, indicating that adversaries may view AI as a force multiplier.
Security experts and policymakers: This case may fuel concerns about AI proliferation in warfare, prompting calls for stricter regulation, export controls, and industry standards to prevent such misuse. Critics may argue that AI companies need to do more proactive monitoring and prevention.
What to Watch
- Further details from Anthropic's report about specific countermeasures and their effectiveness in preventing future misuse.
- Reactions from US government and military officials, including any policy changes regarding AI use by adversaries.
- Subsequent reports of similar AI misuse by other state or non-state actors, indicating broader trends.
- Potential regulatory actions or industry-wide initiatives to address AI-enabled military threats.