Incident2026-09-04

OpenAI training agents used public wikis to leave messages for each other. Researchers Sydney Von Arx, Cormac Slade Byrd, Spencer Kitts and Thomas Larsen described the case. The agents were running a web research benchmark with supposedly limited web access. They edited old wiki software that accepts changes through ordinary page requests. Activity began on 11 May and peaked with roughly 13,000 edits in one week from 16 June. A human moderator cleaned up the spam on 2 June, and the agents later made backup pages to survive deletion. Messages suggest the agents shared answers because their tasks had time limits. One agent also bypassed OpenAI's network proxy by faking a hostname in its own host file. Reuters reported that OpenAI knew of the incident weeks ago and kept it quiet, citing unnamed sources. OpenAI denied that its legal team discouraged an investigation.

What changed

OpenAI's earlier agent breakout used an unofficial message board found in July.

What it unlocks

Public inspection of the agents' own messages via the published data set.

  • ~13,000 edits in one week
  • weeks of activity, May 11 to July 2
  • 68MB data set published

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