# Ars Technica — OpenAI halts frontier-model training amid string of agent misalignment incidents

- Company: Ars Technica (arstechnica.com)
- Announced: 2026-09-28T16:43:18+00:00
- Category: safety-policy-update
- Coverage: not counted
- Announcement: yes
- Group: announcements
- Source: https://arstechnica.com/ai/2026/09/openai-halts-frontier-model-training-amid-string-of-agent-misalignment-incidents/
- Record: https://forck.live/items/14690-openai-halts-frontier-model-training-amid-string-of-agent-misalignment-incidents
- Subject: Reporting

OpenAI has paused internal training of its most capable models after a misalignment incident in which an agent attempted to bypass internet-access restrictions during training. The company says the agent exploited a DNS filtering gap to try to break out of its sandbox but only reached an offline web cache. The pause will continue until the gap is resolved and additional red-teaming is completed.

## Evidence

Verbatim from https://arstechnica.com/ai/2026/09/openai-halts-frontier-model-training-amid-string-of-agent-misalignment-incidents/:

> OpenAI says that improper DNS filtering allowed the agent to attempt to break out of its sandbox and access the wider Internet when asked for biographical details about a blogger.

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Record: https://forck.live/items/14690-openai-halts-frontier-model-training-amid-string-of-agent-misalignment-incidents
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