# Benchmark LLM performance on legal documents: n8n workflow

> Started by another system calling it, and works across Google Drive and Google Sheets. It hands the judgement calls to OpenRouter.

Source: https://millionrounds.com/workflow/benchmark-llm-performance-on-legal-documents (Millionrounds; every figure on the page links to its filing or article)

[Automation library](https://millionrounds.com/workflows) · [Documents and files](https://millionrounds.com/workflows?category=Documents+and+files#library)

# Benchmark LLM performance on legal documents

Started by another system calling it, and works across Google Drive and Google Sheets. It hands the judgement calls to OpenRouter. 15 steps, 1 branch: a working afternoon to understand properly.

Medium Calls a model: OpenRouter

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fbenchmark-llm-performance-on-legal-documents)

**15 steps** Medium: a working afternoon

**1** Branch: places the flow splits

**0** Loops or waits

**2** Services it connects to

## The flow

Starts it 2 Model 3 Logic 5 Service 5

The steps in the order they run, from what starts it.

- 1 **When clicking ‘Test workflow’** Manual trigger *Starts it*
- 2 **Webhook** Webhook *Starts it*
- 3 **Structured Output Parser2** Output Parser Structured *Model*
- 4 **OpenRouter Chat Model** Lm Chat Open Router *Model*
- 5 **Get Tests** Google Sheets *Service*
- 6 **Keep Original Data** Set *Logic*
- 7 **Save Input/Output** Set *Logic*
- 8 **Basic LLM Chain1** Chain Llm *Model*
- 9 **Is PDF?** If *Logic*
- 10 **Merge1** Merge *Logic*
- 11 **Google Drive** Google Drive *Service*
- 12 **Limit (for testing)** Limit *Logic*
- 13 **Extract from File** Extract From File *Service*
- 14 **Execute Subworkflow** Http Request *Service*
- 15 **Update Results** Google Sheets *Service*

## How it's built

- **Starts on:** Another system calling it
- **Steps:** 15, with 1 branch
- **Size:** Medium: a working afternoon
- **Connects to:** Google Drive, Google Sheets
- **Model:** OpenRouter

## Questions

What does it need to run?

An n8n account, plus your own Google Drive and Google Sheets accounts, and a key for OpenRouter. You connect your own accounts after importing it; none are included.

What starts it?

It starts on another system calling it.

Does it use AI?

Yes. It calls OpenRouter. Model calls are billed by the provider, not by n8n.

How long does it take to set up?

Plan an afternoon. 15 steps is enough that you should read each one before running it.

How do I import it?

Copy the workflow, open a new workflow in n8n and paste. The steps appear on the canvas, ready for your own accounts.

**Before you run it**

Nothing here has been tested by us. It is somebody's working automation, read and described from its own steps. Treat the connections it wants as a list of accounts it will touch, and read the 15 steps before you point it at anything that matters.

## Run it in n8n

- **Create your n8n account** Free to start. n8n is where the workflow runs. [Create an n8n account ↗](https://millionrounds.com/n8n)
- **Download the workflow** Free with a Millionrounds account. [Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fbenchmark-llm-performance-on-legal-documents)
- **Paste it into n8n** Open a new workflow in n8n and paste. Then connect your own accounts.

Stored with the author's traces removed: canvas notes, instance identifiers, saved credential names and any live document they had left behind.

## Connects to

Each opens the other workflows that use it.

[Google Drive](https://millionrounds.com/workflows?service=Google+Drive#library)[Google Sheets](https://millionrounds.com/workflows?service=Google+Sheets#library)

## Workflows like it

Also documents and files, with the same services where possible, closest in size first.

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- [**Build a RAG system for PDF documents with Google Drive** 15 steps · calls a model · Google Drive, Pinecone](https://millionrounds.com/workflow/build-a-rag-system-for-pdf-documents-with-google-drive)
- [**Build enterprise RAG system with Gemini** 15 steps · calls a model · Google Drive, Google Sheets](https://millionrounds.com/workflow/build-enterprise-rag-system-with-gemini)
- [**Explain contract PDFs and flag risky clauses with Gemini** 15 steps · calls a model · Gmail, Google Sheets](https://millionrounds.com/workflow/explain-contract-pdfs-and-flag-risky-clauses-with-gemini)
- [**RAG chatbot for company documents with Google Drive and Gemini** 15 steps · calls a model · Google Drive, Pinecone](https://millionrounds.com/workflow/rag-chatbot-for-company-documents-with-google-drive-and-gemi)