LlamaIndex vs DeepSeek V4: Which Is Better in 2026

Last week, I spent three hours debugging a RAG pipeline that kept hallucinating contract dates. The retrieval was pulling the right documents, but the LLM couldn't piece together the context across a 40-page PDF. It's the classic 2026 problem: we have models smart enough to pass the bar exam, but getting them to reliably synthesize your own data without making things up is still a pain.

That's exactly the tension when comparing LlamaIndex an