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Anthropic says northern Yemen cell used Claude Code to write guided-missile software

September 12, 2026 at 21:39 EDT

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Anthropic has disclosed that a northern Yemen cell used its Claude Code tool to develop guidance, navigation and control software for three weapons programs, including a multi-stage ballistic missile with a stated range goal above 2,000 kilometers.

September 2026 · Anthropic

Claude Code on Yemen missile work

A northern Yemen cell used Claude Code as a stand-in for software engineers on three guided-weapons programs. Anthropic banned the accounts and found no fielded weapon.

weapons programs in parallel

>2,000 km

stated ballistic range goal

conventional-weapons cases

Where the six weapons-software cases sat

Each block is one case. Column height is the count — China 3, Russia 2, Yemen 1.

China

Russia

Yemen

Engineering loop Anthropic observed

1. Write GNC
Code, research, review in parallel

→

2. Simulate
6DOF flight paths, firmware builds

→

3. Test-fire
Guided rocket launched; test failed

→

4. Diagnose
Telemetry returned to Claude within hours

What was stopped

Associated accounts banned
Many weapons requests blocked
No operational device found

What limited the disruption

Not every request was refused
Work was split across sessions
An offline toolkit already ran without Claude

Limit on the claim

No evidence a fielded weapon resulted — a guided rocket was test-fired and failed.

Anthropic said visibility into the full program was limited. Analysts also caution that asking a model about a hypersonic glide vehicle is not the same as having the industrial base to build one.

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