Here's a step-by-step walkthrough on how to check which version of ChatGPT you are using
1. Go to your latest response and hover over the "Switch model" icon.
You should be able to see the model that was used to generate the response.

2. Click on the "Switch model" icon to choose a model to generate another response using that model.

That's it! You have successfully viewed which version of ChatGPT you are using!