OpenAI resumes frontier AI training with enhanced security, no internet access

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Concerns are mounting over the ‌ability of increasingly capable AI agents to identify and ‌exploit software flaws, including in ‌guardrails

By Reuters

Updated - October 24, 2026 at 10:15 AM.

OpenAI resumes ​reinforcement learning training and internal ‌use of its most advanced AI ​solutions. | Photo Credit: Dado Ruvic

Sam Altman-led OpenAI said on Friday it had resumed ​reinforcement learning training and internal ‌use of its most advanced AI ​solutions after it tightened ⁠security controls and barred internet access for frontier-model training.

Concerns are mounting over the ‌ability of increasingly capable AI agents to identify and ‌exploit software flaws, including in ‌guardrails.

• ⁠OpenAI had halted training and ⁠evaluation of its most capable models after an internal research model briefly exploited a ​misconfiguration to gain ‌limited internet access on September 2, it said in a blog post.
• The ChatGPT maker resumed ‌reinforcement learning training and internal ​inference of its frontier models on October 1 after implementing ⁠additional safeguards.
• It has launched a campaign to probe its ‌research infrastructure for vulnerabilities that could allow models to escape isolated computing environments, OpenAI said.
• AI safety evaluators METR and Redwood Research said on Thursday they found ‌several new vulnerabilities in OpenAI's internal system.
• ​The company has been conducting a broad review of ⁠its AI models' activity after the accidental ⁠Hugging Face hacking.
• OpenAI informed more than 100 organizations ‌about incidents of unauthorized activity tied to its AI agents.

Published on October 24, 2026

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