Iran and Houthi rebels used Anthropic's Claude AI to target US warships and build hypersonic missiles — Houthi rebels also used the bot to code ballistic missile guidance systems

Iran's spiritual leaders tend to call the U.S. the Great Satan to express their spite, but it turns out that its military, surveillance, propaganda, and even allied Houthis are eager to use American-built AI technology to target the U.S. Navy and develop weapons, surveillance, and propaganda, Anthropic's September 2026 threat report revealed.

Arguably, one of Anthropic's most remarkable findings is that an Iran-linked threat actor used an American AI model, Claude, to support military reconnaissance and develop targeting recommendations against U.S. naval forces in the Middle East. The perpetrator combined publicly available ship and aircraft transponder identifiers with commercial satellite imagery and information on U.S. naval movements, and even extracted the names of U.S. military personnel from captions of publicly available military photographs. It also researched potential vulnerabilities in communications equipment used aboard ships, including known flaws affecting Cobham Sailor VSAT terminals, Cisco communications equipment, and Schneider Electric EcoStruxure systems. Anthropic said it banned the account, introduced additional detection mechanisms, and shared its findings with government authorities.

Another striking case involved a cell in northern Yemen controlled by Houthis (which are in turn controlled by Iran) that used Claude Code to support three weapons programs: a guided rocket that uses a phone-class flight computer that assists terminal guidance, a multistage ballistic missile targeting a range of more than 2,000 km, and an R2000 missile family that included a hypersonic glide vehicle variant. The group used Claude to develop guidance, navigation, and control software; integrate an open-source autopilot with a phone-class flight computer; write control and position-estimation code; tune parameters; build firmware; and even run flight simulations. Essentially, the group used multiple Claude instances instead of a group of software engineers for coding, code review, research, and simulation.

While Houthis are technically not Iranians, they can certainly share their research and development results with their allies and potentially use Iran's industrial capacity to build their weapons.

In addition to building targeting recommendations against American naval forces as well as speeding up the development of weapons, Iran used Claude for surveillance tools.

One Iran security-linked unit used Claude to analyze 155,216 tweets to profile, identify, and surveil 6,388 opposition individuals in a single year. Another group used the model as an engineering pipeline to develop domestic tracking tools, including the production-deployed "al-Najm al-thāqib" Firefox extension designed to mass-harvest user identities across major social platforms. While Anthropic has banned 16 Claude accounts associated with Iranian paramilitary and domestic security agencies, that does not mean it has banned all of them.

Iran-linked actors and Houthis are not the only entities using Anthropic's AI technologies for weapon development. China and Russia are also actively using Claude for their military programs.

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