# Definition of on-demand

## post by yiboliu on Dec 24, 2024

Hi there,

I’d like to confirm some details of on-demand instances. I wanted to deploy a model so that I’m only charged when I use the model to inference or fine tune the model. I only want to inference with it intermittently and want to avoid bills when I don’t use it. But I still would like it to be responsive anytime when I use it.

Is using on-demand instances such a convenient way?

Thanks!

## post by cody_b on Dec 26, 2024

You’re charged for all the time an instance is running, regardless of whether or not the GPUs are being utilized.

[See Lambda’s docs on billing for more info](https://docs.lambdalabs.com/public-cloud/on-demand/billing/#how-are-on-demand-instances-billed).