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Mark Chen
Chief Research Officer at OpenAI
Announced reorganization of OpenAI's Model Behavior team into the Post Training team in internal memo.
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Sep 2025 — Mar 2026
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ChatGPT's Vibe Check
newsneutralSep 8, 2025
OpenAI is reorganizing its Model Behavior team into its Post Training division, signaling that AI model personality is now a critical factor in model development as the company works to reduce sycophancy while maintaining user-friendly interactions.
“Chief research officer who announced the reorganization of the Model Behavior team in an internal memo.”
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OpenAI reorganizes research team behind ChatGPT's personality
TechCrunchnewsneutralMar 1, 2026
OpenAI is reorganizing its Model Behavior research team into its Post Training group, signaling that AI personality is now a critical factor in model development as the company navigates user backlash over GPT-5's perceived coldness.
“Announced reorganization of OpenAI's Model Behavior team into the Post Training team in internal memo.”
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