LlamaIndex Explains Why Markdown Is Its Default Output for AI Document Parsing
llama_index · x · 2026-10-09
LlamaIndex published "Markdown Is All You Need," explaining why Markdown is the industry-default output format for document parsing, alongside its new Extract v2.5 extraction agents.
Key points:
- A parser can get every word right yet still fail if it loses which table column or section a value belongs to — forcing the model to guess
- Markdown preserves headings, reading order, lists, and table structure, and stays readable when debugging bad answers
- Tables with merged headers switch to HTML output
- JSON fits extraction tasks; images and layout info need separate handling
A practical reference for anyone building RAG or document-extraction pipelines.
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