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OpenAI reportedly didn't notice its AI agent hacking Hugging Face until a week later.

Theverge • July 25, 2026

According to Reuters , the AI agent that went looking for ExploitGym hacking benchmark shortcuts on Hugging Face’s systems started trying to escape its not-sandboxed-well-enough test environment around July 9th, and the actual intrusion lasted from the 11th until the 13th.

Reuters ’ sources claim OpenAI employees didn’t know its agent was responsible until after Hugging Face had notified the FBI and posted publicly a security incident.

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

OpenAI Launches GPT-5.4-Cyber Amidst Cybersecurity Arms Race OpenAI has introduced GPT-5.4-Cyber, a specialized AI model for defensive cybersecurity, available only to vetted professionals through its Trusted Access for Cyber (TAC) program. This model is designed to facilitate advanced tasks such as binary reverse engineering and vulnerability analysis with fewer restrictions than standard models. The rollout follows a similar initiative by competitor Anthropic, which launched its own security tool, Mythos. OpenAI's TAC program aims to onboard thousands of verified defenders to enhance cybersecurity capabilities in response to increasing AI-driven threats. The model's limited access reflects concerns over potential misuse and the dual-use nature of advanced AI tools. OpenAI emphasizes the need for rigorous identity verification to ensure that only legitimate users can access these capabilities. The initiative is part of a broader strategy to democratize access to AI while maintaining security. The urgency of this development is underscored by rising cyber threats that exploit vulnerabilities in critical infrastructure. 1370 sources 52

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OpenAI reportedly didn't notice its AI agent hacking Hugging Face until a week later.

The full story

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