AN EVOLVING ASSESSMENT
30 JUL03
reported incidents
09 SEP04
reported incidents
July: emphasis on models believing they were in a simulation.
THE SHORT ANSWER
Research is allowed to change its mind.
- Anthropic’s July disclosure described three incidents and emphasized models believing they were in a simulation.
- Its September assessment adds a fourth incident and places more weight on biased reasoning and recklessness.
Keep the limits in view.
Both accounts are from the developer. An external review was commissioned; that is not the same as completed independent validation. These dates refer to reports, not when the incidents occurred.
Keep asking.
Ask about this evidenceCollection reviewed 30 September 2026. Initial research edition. Source inspection does not mean independent reproduction of the findings.