Stability AI
Open weights you can run yourself, plus a hosted API when you would rather not.
What it is
Pick Stability when control matters more than convenience. The weights are downloadable, which means you can fine-tune on your own catalogue, run inference on your own hardware and keep prompts off anyone else’s logs. The hosted DreamStudio route is the easy path; the self-hosted route is the one that makes it different from every other tool on this page.
Pricing updated 2026-11-13 Official pricing
Model weights are free to download under the community licence; you pay for your own hardware.
Open pricingPay as you go: 1 credit equals $0.01, and 25 credits are free on signup.
Open pricing8 credits per image — the flagship tier based on Stable Diffusion 3.5 Large.
Open pricing6.5 credits; Medium is $0.035 and Flash $0.025 per image.
Open pricingStability AI pricing explained
Two ways to pay, both published. The weights are free to download under the community licence — you pay for hardware and electricity. The API is credit-based at exactly $0.01 per credit, with 25 credits free on signup: SD 3.5 Flash is 2.5 credits ($0.025) per image, Medium 3.5, SD 3.5 Large 6.5, Stable Image Ultra 8 ($0.08). Upscalers run from 2 credits (Fast) to 60 (Creative), edits sit at 4 to 8, and Stable Audio is 8 credits per generation up to six minutes. There are no seats and no monthly minimum, so cost scales with what you actually call.
Free-tier limits are taken from the official pricing page on the update date above. They change often — confirm before you commit to an annual plan.
Stability AI key features
Open weights you can run yourself
Stable Diffusion 3.5 and SDXL ship as weights under a community licence, so the model can run on your own GPU with no per-image fee at all.
A credit-based API for everything else
When you would rather not own the hardware, the same models are sold per call: 1 credit is $0.01 and there is a published price for every endpoint.
Generation, edit and control endpoints
Text to image, inpaint, outpaint, erase, remove background, structure control and search-and-recolor all sit behind one key rather than five vendors.
Upscaling with three different intents
Creative Upscaler reinterprets at 60 credits, Conservative preserves at 40, and Fast simply doubles resolution at 2 — a rare case of pricing matching intent.
Audio and 3D from the same account
Stable Audio generates up to six minutes per call at 8 credits, and 3D models are on the same price list, so a multimedia pipeline needs one bill.
Cheap models and an expensive flagship side by side
Stable Image Ultra costs 8 credits while SDXL starts at 0.9 — you can route a batch job to the cheap model and a hero image to the expensive one.
Stability AI: how it works
Weights first, API second
The original product was a downloadable checkpoint. The API is a convenience layer over the same family, which is why the two can be compared on cost at all.
One credit, $0.01, priced per endpoint
There is no seat and no monthly minimum: each endpoint has a credit cost, so your bill is an arithmetic function of what you called.
Licence terms differ by model
Community licences cover most commercial use but not every case, and the terms changed between model generations — read the licence for the specific checkpoint you deploy.
Stability AI core strengths
The lowest marginal cost per image
At $0.025 for SD 3.5 Flash, a thousand images costs $25. Nothing in the hosted-only category comes close on volume work.
You can leave with the model
Because the weights are downloadable, the API is a choice rather than a lock-in — a property almost no competitor offers.
Transparent per-endpoint pricing
Every service has a credit price in one table, including upscalers and audio, so a cost model takes minutes rather than a sales call.
Breadth beyond images
Audio and 3D on the same key means a product that needs a voiceover and a model asset does not need three contracts.
Stability AI compared with alternatives
| Tool | Stability AI | Midjourney | Leonardo AI | Ideogram |
|---|---|---|---|---|
| Best for | Volume generation and self-hosting, at the lowest per-image cost | Aesthetic quality and a curated community | Game assets, textures and canvas editing | Images with readable text inside them |
| Pricing shape | Open weights free / API from $0.01 per credit ($0.025 to $0.08 per image) | Basic $10 / Standard $30 / Pro $60 / Mega $120 per month | Free / Essential $12 / Premium $30 / Ultimate $60 | Free / Basic $20 / Plus $60 / Team $30 per user |
| Where it runs | Your own GPU, or their API | Their infrastructure only | Their cloud | Their cloud |
Written from the official product pages listed under Sources, not copied from another directory. Prices and limits reflect the update date above; features ship faster than reviews, so treat the list as a starting point and confirm on the official site.
Pros and cons
Strengths
- Only major option where you can run the model yourself
- ControlNet and LoRA ecosystem gives precise structural control
- Commercial licensing is available, not implied
Limitations
- Self-hosting means GPUs, dependencies and updates
- Default output quality needs more prompt work than Midjourney
- Hosted pricing is credit-based and hard to forecast
Stability AI use cases
A catalogue of ten thousand images
Route the batch to SD 3.5 Flash at $0.025 an image and reserve Ultra for the ones that appear on the homepage.
Running models on your own hardware
Download the weights and serve them internally when the images cannot leave the building at all.
Inpainting inside a product
Let users remove an object or extend a frame with a 4 to 5 credit call, instead of building the model pipeline yourself.
Audio and image in one pipeline
Generate a narration and a matching still from the same account, billed per call rather than per seat.
