Pay per usage

On the Standard and Pro plans, once the monthly credits included for Google Sheets GPT formulas are used (about 22M on Standard, 60M on Pro), the formulas are blocked until the next cycle. Pay per usage lets them continue at $0.006 per 1,000 credits ($6 per million), billed at the end of the billing cycle.

1. Open Settings ➤ Subscription or gpt.space/app/settings/subscription.
2. Click Activate pay per usage in the credits card.
3. Set a monthly budget: $10 by default, up to $1,000. When the budget is reached, formulas are blocked until the next cycle. Write to contact@gpt.space for a higher limit.

The same page shows the amount accrued so far in the cycle.

Both are for Standard and Pro plans. Top-ups buy credits in advance ($10 per million) that never expire and work for chat and formulas alike; pay per usage bills formula usage after the fact, within a budget.

A credit always costs the same; what differs between models is how many credits a request consumes, since every request is charged the actual cost of the model. A lightweight model answers many formulas for the credits a single premium call consumes.

• =GPT_WEB uses the web search model, which bills per search, so each call has a minimum charge.
• =GPT_IMAGE consumes credits at the image model’s cost; premium image models cost many times more than the default.

• Monthly subscription: with your monthly invoice.
• Yearly subscription: every month, starting on the day you activated pay per usage.