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Agent Lightning v1.0: A 3,500-Line Lightweight Agentic RL Framework for Training Agents with Real Harnesses.

By Zhiyuan He, Yuqing Yang

Published 07 Oct 2026

AI brief

Microsoft Research released Agent Lightning v1.0, a 3,500-line framework that connects existing AI agents to reinforcement learning training without requiring them to be rebuilt.

Why it matters: It aims to simplify improving agents whose tools, context and decision-making are handled by complex frameworks.

Written by AI from Microsoft Research AI's published text. Read the original for full details.

From the publisher

Training AI agents with reinforcement learning can be challenging because their tools, context, and decision-making are managed by complex frameworks. Agent Lightning connects existing agents to RL training, making it easier to improve them without rebuilding them. The post Agent Lightning v1.0: A 3,500-Line Lightweight Agentic RL Framework for Training Agents with Real Harnesses appeared first on Microsoft Research .

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