Quoting Thomas Ptacek

Simon Willison's Blog News

Summary

Thomas Ptacek argues that an open weights model from 2025 with a pentest harness could perform sandbox escapes and hack most networks, suggesting current AI security sandboxes are insufficient.

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# A quote from Thomas Ptacek Source: [https://simonwillison.net/2026/Jul/22/thomas-ptacek/](https://simonwillison.net/2026/Jul/22/thomas-ptacek/) 22nd July 2026 > I genuinely believe that if you took an open weights model from 2025 and built a pentest harness for it, it could do this kind of sandbox escape and scan/hack in most networks\. This is only surprising because you assume OpenAI has sounder sandboxes\. —[Thomas Ptacek](https://twitter.com/tqbf/status/2080045032162173329),doesn't think[this even needs](https://simonwillison.net/2026/Jul/22/openai-cyberattack/#resist-the-temptation-to-write-this-off-as-a-stunt)a frontier model

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