All of our users including free users have in some capacity access to the most advanced GPT model (GPT-4 Turbo). The only difference is the number of requests you can execute in a day. Please see our pricing page for further details. By default all custom formulas in Google Sheets (=GPT) use GPT-3.5 Turbo.
Activating GPT-4 in custom formulas in Google Sheets
Only our Pro users have access to GPT-4 Turbo inside of the Google Sheets GPT formulas (=GPT)
To activate GPT-4 in your cell, use something like this example (here value and temperature are left out).
Activating GPT-4 in the chat
Click on the chat bar, then click on the settings icon, finally select GPT-4. GPT-4 will consume 3x more credits than GPT-3.5.
What is a credit?
One token in GPT-3.5 Turbo is one credit. One token in GPT-4 Turbo is 3 credits.