> ## Documentation Index > Fetch the complete documentation index at: https://docs.totebot.ai/llms.txt > Use this file to discover all available pages before exploring further. # Compare > A/B test models, temperature, and instructions side by side **Compare** runs the same prompt against up to three versions of your agent at once, so you can see how different models, temperatures, or instructions respond before you commit to a setup. Open it from the **Compare** button on the [Overview](/dashboard/overview) page, or from your agent's sidebar. Compare instances side by side ## How it works * You start with two instances side by side and can **Add an instance** for a third. * With **Sync** on (the default), one input box sends the same message to every instance at once, so you can compare answers head to head. * Turn **Sync** off to message each instance independently. * **Clear all chats** resets the conversations; **Reset** restores the instances to your agent's current settings. ## Tune each instance Click the gear on any instance to change, just for that column: * **Model**: pick any model available on your plan. * **Temperature**: from focused (low) to creative (high). Some models use a fixed temperature. * **Instructions**: try a different system prompt. * **Skills**: toggle individual skills on or off. Changing a setting clears that instance's chat so the next prompt reflects the new configuration. ## What it's for Use Compare to choose the model with the best balance of quality and cost, to tune tone by testing stricter versus looser instructions, and to confirm a change improves answers before you apply it to your live agent in **Settings → AI**.