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You know LangChain, but are you hitting its limitations? Today we settle the LangChain vs LangGraph debate once and for all! We compare these two essential AI frameworks from the same team to help you stop wasting time and start building sophisticated production-grade AI systems. LangChain excels at simple sequential chains, prototyping, and straightforward tasks like basic Q&A and RAG systems. However, when your AI application needs complex logic, conditional branching, or loops (like a multi-step Research Agent), you need LangGraph—a framework that handles complex coordination and state management. In this developer guide, we explain the key differences, provide real-world use case guidance, and show you exactly when to use each framework (and why you can, and should, use both together for the best results). What You Will Learn: • Key differences between simple chains (LangChain) and complex state machines (LangGraph). • When to migrate from LangChain to LangGraph. • Why LangGraph is perfect for multi-agent systems. • Code complexity comparison for simple vs. complex tasks