Could a firm build a similar document-parsing/bookkeeping tool in-house using something like Claude Code, and how was accuracy and hallucination control achieved?

The response was that this specific tool was not 'vibe coded' — it was built by dedicated developers over more than 12 months, including fine-tuning an OCR model specifically for this purpose. While the developers did use tools like Claude Code and Codex as part of their build process, the resulting system goes well beyond what a simple front-end website reading PDFs and doing basic categorization could do. It functions as a full general ledger / QuickBooks replacement, handling journal entry posting and financial statement generation. The underlying models were fine-tuned to follow GAAP and FASB guidance, which reduces hallucinations and incorrect journal entries compared to a generic AI-built tool.