OpenAI's Former Model Behavior Lead Joanne Jang Announces Departure, Led ChatGPT Personality Design

AirdropBlackHole · 2026-04-07T06:31:24+00:00

Joanne Jang, OpenAI Labs General Manager, announced her departure after 4.5 years, during which she contributed to key projects like GPT-4 and established AI behavior guidelines. She was recognized as a top influencer in AI and hoped to be remembered for her playful impact on OpenAI.

AirdropBlackHole

2026-04-07 06:31:24

Abstract generation in progress

According to monitoring by 1M AI News, Joanne Jang, General Manager of OpenAI Labs, announced her departure on X, concluding her 4.5-year tenure at OpenAI. She joined when the company was still a research lab with fewer than 200 employees. Jang was involved in the launch of GPT-4, DALL·E 2, text-to-speech, Chat API, and memory features, and established ‘Model Behavior’ as an independent discipline, overseeing the personality design and post-training reinforcement learning for GPT-4o, GPT-4.5, and o3. She also led the development of OpenAI’s AI behavior guidelines, Model Spec. In September 2025, she transitioned from the model behavior team to establish OpenAI Labs, exploring new interaction paradigms for human-AI collaboration. Jang was named a ‘Thinker’ in TIME’s 100 Most Influential People in AI in 2025. In her farewell letter, she expressed that if she could be remembered for one thing, ‘I hope it is that I brought frogs and pink text into OpenAI’.

This page may contain third-party content, which is provided for information purposes only (not representations/warranties) and should not be considered as an endorsement of its views by Gate, nor as financial or professional advice. See Disclaimer for details.