Igor Babuschkin received replies on X from Mark Tenenholtz, Alex Graveley, Aleksa Gordić, Ying Sheng, Will Depue, Andrew Carr, Banghua Zhu, Deedy Das, and Elie Bakouch. Each message offers brief congratulations. The posts reference River AI raising $1.1 billion to develop AI systems owned and shaped by users. They also mention the River API as the company's first product for building custom agents and LLMs from open-weight models. Babuschkin is identified in the replies as a former xAI co-founder with prior roles at DeepMind and OpenAI.