Prompt Engineering in Practice · Multimodality
OCR and Document Understanding
Multimodality
Introduction
OCR via modern VLMs (GPT-4o, Claude 3.5, Gemini) is not just 'reading text' — it's structural extraction: invoices to JSON, forms to the database, receipts to accounting. The pitfalls: schema-first prompting, hallucinations, multi-page PDFs, compliance and production monitoring.