# Kyle Kosic

> Kyle Kosic is an American AI infrastructure engineer and xAI founding team member. OpenAI credited him as GPT-4 pretraining’s uptime and stability lead. After returning to OpenAI and being reported at Project Prometheus, he announced in 2026 that he joined River AI to work on personal AI.

- **Role:** Team member at River AI
- **Organizations:** River AI, Project Prometheus, OpenAI, xAI, OnScale, Lucena Research
- **Nationality:** American
- **Education:** M.S. in Computer Science, specialization in Machine Learning, Georgia Institute of Technology
- **Known for:** Named uptime and stability lead for GPT-4 pretraining in OpenAI’s published contributions., Credited by OpenAI for GPT-4 distributed training infrastructure and hardware correctness., Listed among xAI’s original 2023 team.

## Career timeline

- **2018-2019** — Studied computer science at Georgia Institute of Technology, specializing in machine learning.
- **Before 2021** — Worked at Lucena Research as a quantitative analyst and at OnScale as a software engineer.
- **2021** — Joined OpenAI.
- **2023** — Credited as uptime and stability lead for GPT-4 pretraining; joined xAI’s original team in May.
- **2024** — Left xAI in April and returned to OpenAI the following month, according to contemporary reporting.
- **2025** — Left his second OpenAI stint by November, according to 2026 reporting.
- **2026-04** — Reported to have joined Project Prometheus for AI infrastructure work.
- **2026-08** — Announced a move to River AI to work on personal AI.

## Achievements

- Named uptime and stability lead for GPT-4 pretraining in OpenAI’s published contributions.
- Credited by OpenAI for GPT-4 distributed training infrastructure and hardware correctness.
- Listed among xAI’s original 2023 team.
- Published open source examples of serving TensorFlow and PyTorch models using Actix Web.

## Latest updates

- **2026-08** — Announced on X that he had joined River AI to work on personal AI.
- **2026-04** — Reported to have joined Project Prometheus to work on AI infrastructure.

## Links

- LinkedIn: https://www.linkedin.com/in/kylekosic/
- Twitter/X: https://x.com/kylekosic
- GitHub: https://github.com/kykosic
- Bluesky: https://bsky.app/profile/kylekosic.bsky.social

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Profile page: https://yespress.io/kyle-kosic
Published by YesPress — https://yespress.io
Last updated: 2026-09-29