Osmosis is a post-training platform that helps companies fine-tune language models using reinforcement learning. We work with fast-growing AI companies to train task/domain-specific models that beat foundation models on performance, cost, and latency.
Osmosis is a Y Combinator company in the Winter 2025 batch. Its directory entry describes it as: Reinforcement Learning (RL) for AI Agents. The founders listed are Kasey Zhang (Founder/CEO), Andy Lyu (Founder/CTO) (Y Combinator directory entry, January 23, 2025).
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New accelerator entry · 2025-01-23 · the record
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Osmosis is a post-training platform that helps companies fine-tune language models using reinforcement learning. We work with fast-growing AI companies to train task/domain-specific models that beat foundation models on performance, cost, and latency. Our platform handles compute orchestration, reward modeling, and training run observability as a CLI-based product usable by developers and agents.
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Example from a real report (our sample on Target): “Target eliminated approximately 1,800 corporate positions, with around 1,000 employees receiving layoff notices and the remainder accounted for by eliminating open roles.” Source: NBC News
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