# Compare different LLM responses side-by-side: n8n workflow

> Started by someone opening a chat with it, and works across Google Sheets. It puts OpenRouter behind a retrieval step, so answers are drawn from documents...

Source: https://millionrounds.com/workflow/compare-different-llm-responses-side-by-side (Millionrounds; every figure on the page links to its filing or article)

[Automation library](https://millionrounds.com/workflows) · [Data collection](https://millionrounds.com/workflows?category=Data+collection#library)

# Compare different LLM responses side-by-side

Started by someone opening a chat with it, and works across Google Sheets. It puts OpenRouter behind a retrieval step, so answers are drawn from documents you supply rather than from the model alone. 14 steps, 1 loop or waits: a working afternoon to understand properly.

Medium Calls a model: OpenRouter Retrieval

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fcompare-different-llm-responses-side-by-side)

**14 steps** Medium: a working afternoon

**0** Branches: places the flow splits

**1** Loop or waits

**1** Service it connects to

## The flow

Starts it 1 Model 4 Logic 7 Service 2

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

- 1 **When chat message received** Chat trigger *Starts it*
- 2 **Simple Memory** Memory Buffer Window *Model*
- 3 **OpenRouter Chat Model** Lm Chat Open Router *Model*
- 4 **Define Models to Compare** Set *Logic*
- 5 **Chat Memory Manager** Memory Manager *Model*
- 6 **AI Agent** Agent *Model*
- 7 **Split Models into Items** Split Out *Logic*
- 8 **Prepare Data for Chat and Google Sheets** Set *Logic*
- 9 **Set model, sessionId, chatInput, sessionIdBase** Set *Logic*
- 10 **Loop Over Items** Split In Batches *Logic*
- 11 **Concatenate Chat Answers** Summarize *Service*
- 12 **Group Model Outputs for Evaluation** Aggregate *Logic*
- 13 **Set Output for Chat UI** Set *Logic*
- 14 **Add Model Results to Google Sheet** Google Sheets *Service*

## How it's built

- **Starts on:** Someone opening a chat with it
- **Steps:** 14, 1 loop or waits
- **Size:** Medium: a working afternoon
- **Connects to:** Google Sheets
- **Model:** OpenRouter
- **Retrieval:** Answers are drawn from documents you supply, not from the model alone

## Questions

What does it need to run?

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

What starts it?

It starts on someone opening a chat with it.

Does it use AI?

Yes. It calls OpenRouter. Its answers draw on documents you give it, not on the model alone. Model calls are billed by the provider, not by n8n.

How long does it take to set up?

Plan an afternoon. 14 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 14 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%2Fcompare-different-llm-responses-side-by-side)
- **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 Sheets](https://millionrounds.com/workflows?service=Google+Sheets#library)

## Workflows like it

Also data collection, with the same services where possible, closest in size first.

- [**& analyze n8n workflows from GitHub with OpenAI** 14 steps · calls a model · Google Sheets, Notion](https://millionrounds.com/workflow/and-analyze-n8n-workflows-from-github-with-openai)
- [**AI agent with Google Sheets** 14 steps · calls a model · Google Sheets](https://millionrounds.com/workflow/ai-agent-with-google-sheets)
- [**Anonymize & reformat CVs with Gemini and Google Sheets** 14 steps · calls a model · Google Drive, Google Sheets](https://millionrounds.com/workflow/anonymize-and-reformat-cvs-with-gemini-and-google-sheets)
- [**Automate GPT-4o fine-tuning with Google Sheets and Airtable** 14 steps · calls a model · Airtable, Google Sheets](https://millionrounds.com/workflow/automate-gpt-4o-fine-tuning-with-google-sheets-and-airtable)
- [**Automate Instagram carousel creation with OpenAI** 14 steps · calls a model · Google Sheets](https://millionrounds.com/workflow/automate-instagram-carousel-creation-with-openai)
- [**Automate Twitter and LinkdIn with Gemini and Google Sheets** 14 steps · calls a model · Google Sheets, LinkedIn](https://millionrounds.com/workflow/automate-twitter-and-linkdin-with-gemini-and-google-sheets)