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

Microsoft ResearchResearch source·
AI brief

Microsoft Research released Agent Lightning v1.0, a 3,500-line framework for training AI agents with reinforcement learning. It connects existing agents to RL training so they can be improved without rebuilding them.

Why it matters: It aims to make reinforcement learning training practical for agents whose tools, context, and decision-making are managed by existing frameworks.

Written by AI from Microsoft Research's published text.

Source

“Training AI agents with reinforcement learning can be challenging because their tools, context, and decision-making are managed by complex frameworks.”
Microsoft Research, 07 Oct 2026, 16:00.

A paper, laboratory publication or research report.

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