Document Understanding

Document understanding requires parsing visually rich documents — invoices, forms, scientific papers, tables — where layout and typography carry as much meaning as the text itself. LayoutLMv3 (2022) and Donut pioneered layout-aware pretraining, but the game changed when GPT-4V and Claude 3 demonstrated that general-purpose multimodal LLMs could match or exceed specialist models on DocVQA and InfographicsVQA without fine-tuning. The persistent challenges are multi-page reasoning, handling handwritten text mixed with print, and accurately extracting structured data from complex table layouts. This task sits at the intersection of OCR, layout analysis, and language understanding, making it one of the highest-value enterprise AI applications.