Billing
Understand how WriftAI billing, credits, and compute usage work.
WriftAI charges based on compute usage, though some models are priced based on input and output instead (for example, LLMs may be priced by token, while transcription, image, or video models may be priced by other units such as seconds of audio or number of images).
Pricing depends on the model you are running and is listed on the model's detail page. See the pricing page for more context.
What is billed
The sections below describe compute-based billing. If your model is priced by input and output, see its detail page for pricing instead.
Billing applies to compute-backed operations, such as running a model.
Other operations (including browsing models, reading metadata, API requests that do not run compute, and local runs) are not billed.
How compute time is measured
WriftAI bills for the time a compute instance is actively running your workload.
Cold starts are not billed
If a model is not already running, WriftAI may need to spin up an instance. Time spent waiting for the instance to start is not charged.
Billable time
Billing only begins once the instance is ready and may include:
- Loading model weights
- Initializing the runtime
- Any active processing after the instance is available
Cancelled workloads
If a workload is cancelled before completion, billing stops once the cancellation takes effect. You are only charged for the compute time consumed up to that point.
Billing granularity
Compute usage is billed per second.
- All charges are rounded up to the nearest second
- Partial seconds are billed as a full second
Credits
WriftAI uses a prepaid credit system. Credits are consumed as you run models.
Auto-reload
You can configure auto-reload to automatically add credits when your balance drops below a configured threshold.
Auto-reload settings include:
- A minimum balance
- A target balance to refill to
Viewing usage and charges
You can purchase credits, view your credit balance, compute usage, billing history and invoices from the Billing page on your dashboard.
Credit validity
Purchased credits are valid for 1 year from the purchase date and are non-refundable.
Charges exceeding available credits
In rare cases, compute usage may exceed your available credit balance. When this happens, the excess amount is charged to the default payment method on file.