Documentation
Everything you need to know to get the most out of LLM Decision Lab. Learn how to compare AI models, read results, manage your history, and more.
Welcome to LLM Decision Lab
LLM Decision Lab lets you send a single prompt to multiple AI models — ChatGPT, Claude, Perplexity, and Gemini — and compares their responses side by side with an AI-powered evaluation. You get scores, strengths, weaknesses, and a best-combined answer so you can pick the right model for any task.
Quick Start (3 Steps)
1. Create a free account or log in. 2. Go to the Compare page and enter your prompt. 3. Select at least two AI models and hit "Compare Models" — results appear in seconds.
Do I need an account?
You can browse the Home and Pricing pages without an account, but you must be logged in to run comparisons, view history, and save settings. Free accounts get a limited number of comparisons per month — upgrade anytime on the Pricing page.