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AutoGen

Free tier

Build multi-agent AI applications with conversable, customizable agents powered by LLMs

Free·Technical·Powered by OpenAI, Azure OpenAI, and others·API available·Open source

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Key strengths

Multi-agent conversation orchestrationFlexible agent customization and role assignmentHuman-in-the-loop supportBroad LLM backend compatibilityOpen-source with active Microsoft Research backing

Completely free

Redmond, USA

Founded 2023

Self-hostable

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Code generation & execution loops — use AssistantAgent + UserProxyAgent with Docker-sandboxed code execution for safe iterative code generation and testing
RAG-augmented agents — integrate vector stores (e.g., Chroma, Qdrant) with RetrieveAssistantAgent for retrieval-augmented generation pipelines
LLM benchmarking harnesses — automate evaluation of LLM outputs across multiple models using AutoGen's flexible multi-model config support
Tool-use and function-calling workflows — register external APIs or Python functions as callable tools for structured, grounded agent responses
Distributed agentic systems — leverage AutoGen v0.4's gRPC-based GrpcWorkerAgentRuntime for horizontally scalable, microservice-style agent deployments
Human-in-the-loop pipelines — configure human_input_mode on UserProxyAgent to gate agent actions on human approval at critical decision points