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How We Built a 99% Accurate Invoice Processing System Using OCR and LLMs
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How We Built a 99% Accurate Invoice Processing System Using OCR and LLMs

Vaibhav Rathi
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February 9, 2026

Author(s): Vaibhav Rathi Originally published on Towards AI. We had a working RAG solution at 91% accuracy. Here’s why we rebuilt it with fine-tuning and what we learned along the way. Our client was spending eight minutes per invoice on manual data …

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