How much is a Stability credit worth?

One credit equals one US cent ($0.01). Stability sells credits in prepaid bundles, so a 1,000-credit purchase costs about ten dollars and the calculator converts your batch directly into that currency.

Why do prices differ between models?

Larger, higher-quality models cost more compute to run. Stable Image Ultra is the most expensive per image, Core is the budget option, and the SD3.5 family sits in between. SDXL is priced by sampling steps rather than a flat rate.

Do sampling steps change the price?

Only for step-priced models such as SDXL. The flat-rate models (Ultra, Core, SD3.5) charge a fixed credit cost per successful generation regardless of steps, so the step field is hidden for them.

Is this the exact price I will pay?

It is a close planning estimate based on Stability's published per-generation rates. Always confirm against your live Stability account dashboard, since pricing and model lineup change over time.

Stability AI API Credit Calculator

Stability AI API credit calculator

Stability AI’s image API bills in credits, where one credit equals one US cent. Different models burn credits at very different rates — Stable Image Ultra is premium, Core is cheap, and SDXL is priced by sampling steps — so a batch of a few thousand images can range from a few dollars to a few hundred. This calculator turns your model, step count, and image volume into a credit total and its dollar equivalent.

How it works

Each model carries a per-image credit cost. For flat-rate models (Ultra, Core, SD3.5 Large / Medium), the tool multiplies that fixed cost by your image count. For SDXL, which is step-priced, it scales the baseline 50-step cost linearly by your chosen step count, then multiplies by volume. The final figure is shown in both credits and USD at the standard $0.01-per-credit rate, plus a per-image breakdown so you can compare models at a glance.

Tips for controlling cost

Match model to need. Use Core for drafts and bulk work; reserve Ultra for hero shots where quality justifies the higher per-image credit cost.
Trim SDXL steps. Quality plateaus well before 50 steps for many prompts — dropping to 30 steps cuts the per-image cost proportionally.
Buy credits in bundles. Stability sells prepaid credit packs; estimating the batch first avoids over- or under-buying.
Confirm against the dashboard. Model pricing shifts over time, so treat this as a planning estimate and verify current rates in your Stability account.