Agent Lightning
Microsoft's lightweight trainer that improves existing agents with reinforcement learning through a model proxy, without rewriting the agent's tools or control flow.
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About Agent Lightning
Agent Lightning is listed in our frameworks category and is aimed at builders. Microsoft's lightweight trainer that improves existing agents with reinforcement learning through a model proxy, without rewriting the agent's tools or control flow. Pricing, as the maker states it: Open source. Maturity: Mature. We last checked the official link on 2026-10-17.
Agent Lightning alternatives
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Ruflo
Open-source multi-agent meta-harness for Claude Code, Codex, and MCP clients; Oct 13 release adds Mods (mission workflows) and a single control plane with human approval.
Hermes Agent (Nous Research)
Open-source agent harness; v0.21.7 stable shipped Oct 12, v0.22.0 RCs Oct 13-14.
OpenAI Agents SDK (Python)
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LangChain Deep Agents
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LangGraph
Framework for stateful, graph-based agent workflows.
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