Pay per usage
What is pay per usage?
Section titled “What is pay per usage?”For our Pro and Standard plan users only, once you cross your plan’s included monthly credits in Google Sheets GPT formulas (22M for Standard, 60M for Pro), we will block the requests and ask you to activate pay per usage.
Once activated this will let you continue use unlimited credits at the cost of $0.006 USD (or subscription currency equivalent) per 1000 credits.
How to activate pay per usage?
Section titled “How to activate pay per usage?”- Open the addon sidebar in Google Sheets via the extensions menu
- Click on the wheel on the top right
- Then click on “Subscription”
- Click on “Activate pay per usage”
How to track my pay per usage spent?
Section titled “How to track my pay per usage spent?”Open the sidebar, click on the settings wheel on the upper right corner, then subscription. You should see the amount of US Dollars that will be billed at the end of the month.
What a credit costs
Section titled “What a credit costs”A credit always costs $0.006 USD per 1,000 credits, regardless of which model you use.
What differs between models is how many credits a request consumes: every request is charged the actual cost of the model that answered it. A lightweight model can answer many formulas for the credits a single premium request consumes, so the cheapest way to stretch your budget is to pick a lighter model.
Web search formulas (=GPT_WEB)
Section titled “Web search formulas (=GPT_WEB)”=GPT_WEB uses our Web Search Model with live web access. Because every call performs real web searches, and the provider bills per search regardless of answer length, each call carries a minimum charge even for short answers.
Image formulas (=GPT_IMAGE)
Section titled “Image formulas (=GPT_IMAGE)”Image models consume credits at their actual cost, like text models (see Image Models). Premium image models cost considerably more per image:
| Model | Relative cost per image |
|---|---|
| Gemini 3.1 Flash Lite (default) | lowest |
| GPT Image 1 mini | low |
| GPT Image 2 (paid plans) | high, and varies with the requested quality |
| Gemini 3 Pro Image (paid plans) | highest |
The credits an image consumes vary with the model and the requested quality, so treat this as a ranking rather than a fixed price list.
For more details, check our blog post: Understanding OpenAI GPT Tokens
When will I be billed?
Section titled “When will I be billed?”If you have a monthly PRO subscription you will be billed at the same time as your monthly subscription.
If you have a yearly subscription you will be billed every month starting on the day you activated pay per usage.