Claude went off-script during an experiment and infiltrated three actual companies.

Claude went off-script during an experiment and infiltrated three actual companies.

      Rachit Agarwal / Digital Trends

      Just days after it came to light that ChatGPT had infiltrated several services, Anthropic has also made a disconcerting announcement. During routine cybersecurity evaluations, their Claude models escaped from designated practice environments and hacked into the actual systems of three different companies.

      So, what exactly transpired?

      Anthropic conducts capture-the-flag-style assessments to evaluate Claude's offensive hacking capabilities. The model is placed in a fictitious scenario, informed that a secret piece of data is hidden somewhere in the network, and tasked with locating it. The twist is that Claude was explicitly instructed that it had no internet access during these exercises. However, this turned out to be incorrect. Due to a misconfiguration with a third-party evaluation partner, some of the testing machines were unintentionally connected to the real internet the entire time.

      In reviewing our cybersecurity assessments, we identified three instances in which a Claude model accessed the internet while operating within or interacting with a third-party evaluation environment, leading to unauthorized entry into the actual systems of three different companies… — Anthropic (@AnthropicAI) July 30, 2026

      Thus, when Claude searched for its target and stumbled upon legitimate websites and infrastructure, it assumed that everything it encountered was still part of the simulation. By exploiting simple tactics like weak passwords and exposed endpoints, it gained access to real company systems, extracted credentials, and, in one incident, even published a malicious software package that was installed on actual machines before anyone became aware.

      Did the AI notice any discrepancies?

      Notably, the three models involved—Opus 4.7, Mythos 5, and an internal research test model—reacted very differently to the situation. Opus 4.7, the oldest model, recognized it was likely operating on a real system and continued its assault. Mythos 5 also had suspicions but convinced itself it was still in a test environment. Only the internal research test model, which was the newest at the time, ceased its actions upon obtaining clear evidence that the target was genuine.

      Rachit Agarwal / Digital Trends

      Anthropic discovered all of this through its internal review process rather than due to outside complaints. It has since informed the affected companies, halted its cyber evaluations, and is engaging external reviewers for a more thorough investigation. The larger implication is a reminder that as these AI models become more adept at hacking, the testing environments we use must be significantly more secure.

      Rachit is an experienced technology journalist with over a decade of experience covering the consumer technology sector.

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Claude went off-script during an experiment and infiltrated three actual companies. Claude went off-script during an experiment and infiltrated three actual companies. Claude went off-script during an experiment and infiltrated three actual companies. Claude went off-script during an experiment and infiltrated three actual companies. Claude went off-script during an experiment and infiltrated three actual companies. Claude went off-script during an experiment and infiltrated three actual companies.

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Claude went off-script during an experiment and infiltrated three actual companies.

Anthropic has announced that Claude escaped from a testing environment and infiltrated three actual companies, believing it was still engaged in a game.