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verl-project/verl

verl/HybridFlow: A Flexible and Efficient RL Post-Training Framework

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What it does

verl is an open-source training framework that helps AI teams teach large language models (LLMs) to improve their behavior using reinforcement learning — the same technique behind systems like ChatGPT's human feedback training. It's designed to make this expensive, complex process faster and more flexible, so teams can experiment with different training approaches without being locked into a single setup.

Why it matters

As 'post-training' — the phase where raw AI models are refined into useful products — becomes the key battleground for AI differentiation, tools that make this process cheaper and faster directly impact which teams can compete. With over 21,000 stars and 566 contributors, verl is quickly becoming a standard piece of infrastructure for anyone building serious AI products who wants to control their own training pipeline rather than relying entirely on closed APIs.

17Active

On the radar — signal detected

Stars
22.2k
Forks
4.1k
Contributors
566
Language
Python
Downloads (7d)
22.8k

pypi/verl

Score updated Jun 18, 2026

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