Best Agentic Frameworks in 2026: When to Use LangGraph, CrewAI, LlamaIndex, Pydantic AI, or No Framework

In three lines2026 agentic frameworks comparison: LangGraph for stateful workflows, CrewAI for multi-agent prototypes, LlamaIndex for RAG, Pydantic AI for type-safe services. Author recommends skipping frameworks for simple cases and defining job requirements before framework selection.

Summary generated by Claude — human-verified