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title: Multiple Model Debugging
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The **Chatbot** application supports the **“Debug as Multiple Models”** feature, allowing you to simultaneously compare how different models respond to the same question.

![](https://assets-docs.dify.ai/2025/02/6b77275258e6d48a540251beed0d16f3.png)

You can add up to **4** large language models at once.

![](https://assets-docs.dify.ai/2025/02/226b016ca72a7a914fe94f8b804d1334.png)

During debugging, if you find a model that performs well, click **“Debug as Single Model”** to switch to a dedicated preview window for the model.

![](https://assets-docs.dify.ai/2025/02/d273dee2ec4c04f7208a4f7a8b3a86db.png)

## FAQ

### 1. Why aren't additional models visible when adding LLMs?

Go to [“Model Providers”](/guides/model-configuration), and follow the instructions to add the keys for multiple models manually.

### 2. How to exit Multiple Model Debugging mode?

Select any model and click **“Debug with a Single Model”** to exit multiple model debugging mode.

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