How to use a second AI model inside ChatGPT
Updated June 15, 2026
Quick answer
Using a second AI model inside ChatGPT requires either manual copy-pasting to another provider in a new tab, or using a multi-model API aggregator. To avoid the hassle of external tabs, GPT Master integrates a Side Chat panel directly into your ChatGPT tab. Highlighting any response lets you prompt an independent third-party model in the right panel, giving you two different AI perspectives side-by-side.
Comparing outputs from different AI providers is the best way to get a balanced answer. While ChatGPT excels at many tasks, a different model might write cleaner code, explain a concept more simply, or catch a logical error. Typically, doing this comparison means keeping multiple tabs open and copy-pasting text between different web apps. This process is tedious and breaks your creative flow. Running a second model in a side panel allows you to compare answers without leaving your active chat window.
- 1
Select text from the active ChatGPT conversation
Locate the output you want to analyze with a different model. Drag your cursor to highlight the text. A popup button labeled "Ask in Side Chat" will appear above your selection.
- 2
Launch the Side Chat panel
Click the popup button. The right panel will expand next to the main ChatGPT interface, with your highlighted text already loaded as context.
- 3
Query the secondary model
Type your question in the side panel input. The query goes to an independent third-party model. You can read both models' outputs side-by-side to compare their logic and tone.
GPT Master
Add a second AI model directly to your ChatGPT interface.
Frequently asked questions
- Can I choose which model runs in the side panel?
- The extension routes queries through our server to a dedicated third-party model optimized for quick comparisons. This ensures you get a genuinely different perspective from OpenAI's default outputs.
- Does using the second model affect my ChatGPT limits?
- No. Because the side panel runs on our own server infrastructure, it does not use your ChatGPT plan or count toward your OpenAI message caps.
- Can I copy the side panel response back into my main chat?
- Yes. You can copy any text from the side panel and paste it into the main ChatGPT prompt box if you want to feed that perspective back into your primary thread.
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