For developing LLM applications in 2026, developers can choose from three primary frameworks: LangChain, LlamaIndex, and Haystack. LangChain is the most popular for general-purpose applications and agent orchestration, boasting a mature ecosystem. LlamaIndex excels in data indexing and retrieval, particularly for RAG systems dealing with large document sets. Haystack is a robust option for production NLP pipelines requiring enterprise-grade reliability and maturity, especially for search and QA tasks. AI
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IMPACT Helps developers choose the right framework for LLM application development based on specific needs like RAG or agent orchestration.
RANK_REASON Comparison of existing AI development frameworks.