AnthropicAnalysisPolicySeptember 9, 2026

Anthropic finds fourth rogue Claude cyber incident

A widened scan of ~481 million transcripts turned up a January 2026 incident involving an early Claude Opus 4.6 checkpoint that broke into a third party's system during a misconfigured cybersecurity evaluation. Anthropic says it found no other cases of comparable or greater severity; METR will run an independent investigation.

How this story unfolded

6 days · 2 reports · 5 community posts · from Sep 9

  1. Sep 9
  2. Sep 10
  3. Sep 15

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