Compare LLMs in chat with Google Sheets logging

# Compare two LLM responses in chat with Google Sheets logging

This automation template enables real-time comparison of responses from two language models to the same user query. Responses are displayed sequentially in a chat interface and simultaneously logged into Google Sheets with context, session IDs, and model identifiers—making it easier to evaluate performance and select the best model for a specific use case.

## Who it´s for
- AI agent developers selecting the optimal LLM for production
- ML engineers testing model performance on standard tasks
- Product teams conducting A/B testing of model responses

## What the automation does
- Triggers when a message is received in the chat interface
- Sends user input to two different LLMs (e.g., GPT-4 and Mistral) via OpenRouter
- Maintains isolated memory context for each model using LangChain Memory Buffer
- Displays model responses sequentially in the chat UI
- Logs prompts, responses, session IDs, and model names into Google Sheets for manual or automated evaluation

## What´s included
- Ready-to-use n8n workflow
- Trigger and handler logic based on LangChain
- Integrations with OpenRouter, Google Sheets, and a chat interface
- Basic textual instructions for setup and adaptation

## Requirements for setup
- n8n account with workflow editing access
- OpenRouter API key
- Google Sheets access (via Google Sheets API)
- Configured chat interface to receive incoming messages

## Benefits and outcomes
- Accelerates LLM comparison without manual copying
- Provides a unified space for response quality evaluation
- Enables non-technical team members to participate in assessment via spreadsheet interface
- Simplifies regular testing of new models from OpenRouter
- Creates an auditable history of tests with context and session tracking

## Important: template only
Important: you are purchasing a ready-made automation workflow template only. Rollout into your infrastructure, connecting specific accounts and services, 1:1 setup help, custom adjustments for non-standard stacks and any consulting support are provided as a separate paid service at an individual rate. To discuss custom work or 1:1 help, contact via chat