> ## Documentation Index > Fetch the complete documentation index at: https://docs.langtrace.ai/llms.txt > Use this file to discover all available pages before exploring further. # Model Playground > Langtrace has a model playground where you can interate on your prompts with different models and model settings to see how they perform. ## How to use the model playground Step 1: Make sure you add your model API keys from Langtrace settings. We do **NOT** store your API keys. They are stored in your browser's local storage. API Key Settings Step 2: Go to the Model Playground tab inside your project. Here you can add your prompts(3), switch roles, and select different models(2) and model settings(5) to see how they perform. Playground Step 3: Additionally, you can also import entire conversations that were traced and also prompts from prompt registry for iteration and testing. Playground **How to import traced conversations** Playground **How to import prompts from prompt registry** Playground