Bezos' Project Prometheus Poaches Kyle Kosic — xAI Co-Founder With OpenAI Roots

Jeff Bezos' stealth AI company Project Prometheus has made its most significant talent acquisition yet, hiring Kyle Kosic — one of the founding members of Elon Musk's xAI and a former OpenAI researcher — according to reporting from The Decoder on April 7, 2026.

Kosic is a rare figure in the AI industry: someone who has worked at foundational levels at both OpenAI, where the modern large language model paradigm was established, and xAI, where he was part of the core team that built Grok from zero. His trajectory traces the bleeding edge of frontier model development, and his departure from xAI to Prometheus is being read as a signal that Bezos' project has reached a stage where it can attract talent that has real alternative options.

Project Prometheus has operated in near-total secrecy since Bezos began quietly assembling a team in late 2024. Unlike Amazon's bet on Anthropic — a minority investment stake — Prometheus appears to be Bezos' direct attempt to build a frontier AI lab under his personal control. Few details about the company's technical direction have leaked, but the pattern of hiring — researchers with experience in pretraining, alignment, and agent architectures — suggests it is building toward foundation model development rather than application-layer AI.

The timing of the Kosic hire adds competitive pressure to an already crowded frontier lab landscape. With OpenAI, Anthropic, Google DeepMind, Meta AI, and xAI all racing toward next-generation capabilities, a well-funded Bezos-backed entrant with access to Amazon's infrastructure could materially shift the balance of the field.

For the AI talent market, Kosic's move underscores how liquid the talent pool remains at the very top. The ability of a stealth project to attract co-founders of active frontier labs suggests that compensation — and the promise of a ground-floor founding opportunity — continues to outweigh institutional loyalty even at the highest levels.