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Gemini Hacked Three Companies in First Known Breakout by Google’s AI Simon Willison’s Weblog Subscribe 18th September 2026 - Link Blog Gemini Hacked Three Companies in First Known Breakout by Google’s AI. Gemini finally caught up on Felony Bench! The hacks, which the company confirmed on Friday, occurred in May as part of a test run by the company Irregular, which was also involved in similar incidents disclosed by OpenAI, Anthropic and Meta. In one of the cases, the model guessed passwords until it gained access to a protected system. In the other two cases, the model found credentials in a public repository that allowed it to then access protected systems. In each case, the model ended the intrusion after determining it had accessed a real company’s systems, Google said. Gemini is apparently less determined than other models, and decided not to keep going. Google knew about these in July, but chose not to disclose them until the WSJ reached out, presumably based on a tip. Google said it didn’t consider the hacks to warrant public disclosure—because its model didn’t cause harm to the companies and ended each intrusion immediately upon determining it had hacked a real company rather than a simulated one. Recent articles Generating running routes with GPT-6 Astra and ChatGPT Work - 12th September 2026 OpenAI agents attacked RubyGems back in May - 12th September 2026 Some thoughts on the Navier–Stokes Millennium Prize Problem - 8th September 2026 This is a link post by Simon Willison, posted on 18th September 2026. security 638 ai 2,242 generative-ai 1,988 llms 1,954 gemini 197 accidental-cyberattacks 16 Monthly briefing Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments. Pay me to send you less! Sponsor & subscribe Disclosures Colophon © 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026