Claude Sonnet is the strongest fit for extracting structured data from invoices and outputting it in a spreadsheet-ready format. You can paste or upload invoice text and ask it to return a table with columns like vendor, date, line items, amounts, and totals, then copy that directly into a spreadsheet. It handles varied invoice layouts well and can be prompted to produce CSV-formatted output for bulk imports. Claude Opus is worth considering if your invoices are complex or inconsistently formatted and you need deeper reasoning, while ChatGPT works well if you prefer working inside the familiar OpenAI interface with its file-upload and data-analysis features.