AI infrastructure

Osmosis

Website

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 C

Founded 2024Origin source ↗Checked 2026-09-15

Overview

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.

Company description As recorded 2026-11-08
LinkedIn About
AI infrastructureInfrastructureBusinessesDevelopersUsage & volume pricing

Product & workflow

We work directly with customers to support the entire post-training workflow - from feature engineering to reward function creation.

Source-reported As recorded 2026-11-07

Founders & team

Previously Gulp

Company history As recorded 2026-11-08

Andy Lyu

Founder/CTO

Defining how real time systems should be built. Previously worked on data architecture and ecosystem at TikTok recommendations as the 5th and youngest US hire

LinkedIn X
Founder profile As recorded 2026-09-15
6team members reported
Source-reported As recorded 2026-09-15

Founded 2024 · Source

News & product activity

Sources & observations

Hacker News · Y Combinator

Profile depthenriched profile
Website observationwebsite reachable
Last website check2026-11-11
Location · source statedSan Francisco, CA, USA
Pricing evidenceNo pricing page confirmed
Maturity: Not assessed · 3 of 6 areas documented

Source-based assessment · automated evidence rules

The retained text does not establish product availability or customer use.

Maturity is an evidence-based assessment, not a success rating. It may understate the current stage where evidence is limited. Coverage records documented areas, not a complete or independently audited company history.

Stage definitions
independent websitesource corroborationreachable websitedescriptive evidenceclassified market and modelsourced peoplesourced founding yeardated product or funding activity
startup.observe Directory coverage · Sources & method