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OpenAI fired three safety researchers, including Tomek Korbak, after investigators found they used disappearing messages on Signal. The firings occurred on 1 October following a 1 September report by The Information about Astra model reasoning. OpenAI claims policy violations, while researchers deny leaking confidential data.
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Summary by ByteBrief

OpenAI suspected the three fired researchers of leaking internal model designs to AI safety researcher Ryan Greenblatt, including via disappearing Signal chats (Wall Street Journal)
The Leak Suspicions That Got Three OpenAI Staffers Fired

OpenAI Safety Researchers Deny Leaks