The ability to extract relevant and accurate data from diverse sources is crucial for informed decision-making, process optimization, and strategic planning. Large language models (LLMs) and their APIs have expanded the capabilities of traditional LLMs, enabling them to extract data directly from a wide range of documents, including PDFs and scanned images. For document analysis, the typical workflow involves converting documents to images or extracting text using vision APIs or direct extraction methods. When selecting an LLM API for data extraction, consider key features such as accuracy and precision, scalability, integration capabilities, customization options, security and compliance, context lengths, prompting techniques, structured outputs, performance metrics, complex document handling, user experience, and pricing models. Nanonets OCR excels in extracting structured data from financial documents with high precision, while ChatGPT-4 offers balanced performance across various document types but may need prompt fine-tuning for complex cases. Gemini 1.5 Pro and Claude 3.5 Sonnet are strong in handling complex text, with Claude 3.5 Sonnet particularly effective in maintaining document structure and accuracy. For sensitive or complex documents, consider each API's ability to preserve the original structure and handle various formats. Choosing the right API depends on understanding each option's strengths and how they align with your project's needs.