Yuhuai (Tony) Wu, a co-founder of xAI and a key contributor to Grok’s advanced reasoning capabilities, including work on STaR, Minerva, and AlphaGeometry, announced his resignation from the company on 10 February 2026. In a heartfelt post, Wu thanked the xAI team and Elon Musk, describing his time at the company as a “ride of a lifetime” while expressing excitement about future AI possibilities with small, AI-empowered teams. The departure, highlighted by AI researcher Yuchen Jin, makes Wu the fourth co-founder to leave xAI. Discussions on X also noted that researcher Greg Yang continues to face health issues. Despite these leadership changes, observers have wished xAI continued success as it works to develop competitive frontier models amid an increasingly intense global AI race. Meanwhile xAI posted hiring requirement for World Modeling. SpaceX Acquires xAI: Elon Musk Unveils Vision for 1 Million Satellite ‘Orbital Data Centres’ To Power Global Artificial Intelligence.

xAI Co-Founder Yuhuai (Tony) Wu Resigns 

xAI Hiring for World Modeling

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