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Building foundation models specifically for software development
HQ: San Francisco, CA, United States | Founded: 2023 | Employees: ~150 | Stage: Late Stage VC | Website: https://poolside.ai
Poolside AI is an American artificial intelligence company that trains its own foundation models specifically for software development and sells them to enterprises and regulated-industry customers who run the system on-premises or inside their own clouds. Founded in May 2023 by Jason Warner, the former CTO of GitHub, and Eiso Kant, a serial developer-tooling entrepreneur behind source{d} and Athenian, the company's core technical bet is Reinforcement Learning from Code Execution Feedback (RLCEF) — a training methodology that generates synthetic data from code execution rather than relying on proprietary customer code.
The company's flagship products include the Malibu and Point first-generation models, and from April 2026, the Laguna model family — including Laguna S 2.1, a 118-billion-p
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