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Kosic was one of the original eleven co-founders of Elon Musk's artificial intelligence company, xAI, serving as a Member of the Technical Staff.

Left his position as a co-founder at xAI, reportedly being the first of the original founding team (besides Elon Musk) to depart.

After leaving xAI, Kosic joined rival AI research and deployment company OpenAI for a brief period.

Was hired by Jeff Bezos's secretive new AI startup, reportedly named 'Project Prometheus,' to work on AI infrastructure.