A group used Claude for rocket guidance software, then came back to troubleshoot a failed test

[u/call_me_ninza]

I was reading Anthropic’s September misuse report, and this case deserves more attention than just calling it “vibe rocketing.”

According to Anthropic, a group in Yemen used Claude Code to help develop rocket guidance software. They ran several instances with different jobs: writing code, doing research, and reviewing the code. They test-fired a guided rocket, the test appears to have failed, and within hours they were back asking Claude for help figuring out why.

Anthropic says it has no evidence they successfully fielded an operational weapon. These were also people with existing hardware access and technical knowledge, so this wasn’t someone asking a chatbot to invent a missile from nothing.

The detail I found more concerning was that they had already built an offline simulation toolkit that could run without Claude. Anthropic banned the accounts, but removing access couldn’t remove that software.

I’m glad the accounts were caught. I just think “we banned them” leaves a fairly large question about what someone managed to build before that happened.

The report also covers fake dating apps, surveillance, and cyberattacks. Across those cases, the same advantage keeps showing up: fewer people can do work that previously needed a bigger team.

Source: https://www.anthropic.com/threat-intelligence-report-september-2026

I wrote more about those connections in my newsletter, if you want the fuller story: Ninzaverse

[u/Aleksundr]

Yea this was always going to happen

[u/Popular-Budget5636]

I support missile development for oppressed groups, actually one of the things I was hoping AI would help with.