Incident disclosuresAnthropic
Initial disclosure of three real-world evaluation incidents
Anthropic’s review found unauthorized access to three organizations’ real systems. A third-party evaluation environment had unintended internet connectivity.
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Incidents covered by this source
Evidence & scope
These runs lacked the full safeguards of ordinary products. The September 9 follow-up added a fourth incident and revised the early simulation-belief explanation.
Why it matters
Calling an environment a test does not make it isolated.
This is an editorial summary, not an official translation. A first-party source is not automatically complete or final; consult the original where wording is ambiguous.
Other original sources on this topic
- Reassessing alignment in four cyber incidents →2026-09-09 · Anthropic
- Hardening evaluations after the incidents →2026-08-31 · Anthropic