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

By Thomson Reuters Oct 23, 2026 | 3:06 PM

Oct 23 (Reuters) – 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

(Reporting by Jaspreet Singh in Bengaluru; Editing by ​Pooja Desai)