Mistral OCR, GPT-4o-mini, and Google Sheets Integration for Enhanced Data Processing

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Built by Antonio Gasso Antonio Gasso
Created on June 15, 2026

Description

Process multiple invoices automatically using Mistral's dedicated OCR model—at approximately $0.002 per page. Upload batches of PDF, PNG, or JPG invoices through a simple form, extract structured financial data with AI, validate results with confidence scoring, and save everything to Google Sheets.

What this workflow does

Accepts multiple invoice uploads via n8n Form Trigger
Processes files in batch with rate limiting
Converts each file to base64 and sends to Mistral OCR API
Extracts 9 standard fields using GPT-4o-mini Information Extractor
Validates data and assigns confidence scores (high/medium/low)
Saves all results to Google Sheets with status tracking

Fields extracted

Invoice Number, Date, Vendor Name, Tax ID, Subtotal, Tax Rate, Tax Amount, Total Amount, Currency

Use cases

Accountants processing client invoices in bulk
Small businesses digitizing paper receipts
Bookkeepers automating repetitive data entry
Finance teams building searchable invoice databases

Setup requirements

Mistral API Key (console.mistral.ai) — HTTP Header Auth credential
OpenAI API Key (platform.openai.com)
Google Sheets OAuth connection
Google Sheet with 15 columns (template in workflow notes)

Nodes Used (5)

Code
n8n-nodes-base.code
Google Sheets
n8n-nodes-base.googleSheets
HTTP Request
n8n-nodes-base.httpRequest
Information Extractor
@n8n/n8n-nodes-langchain.informationExtractor
OpenAI Chat Model
@n8n/n8n-nodes-langchain.lmChatOpenAi