Stability AI API playground
This tool calls the Stability AI Stable Image API directly from your browser with your own key, so you can compare SD3, SDXL, and Stable Image Core on the same prompt without writing code. Set the aspect ratio, an optional negative prompt, and a style preset, see the credit cost for your chosen model, and generate inline.
How it works
On generate, the playground POSTs a multipart/form-data request to the
appropriate Stable Image endpoint (for example
https://api.stability.ai/v2beta/stable-image/generate/core) with an
Authorization header carrying your key and accept: image/* so the API returns
the image bytes. The browser turns those bytes into an object URL and shows the
result. There is no backend and nothing is stored.
Tips and notes
- Start with Core to iterate cheaply. It is the fastest and lowest-credit model — dial in your prompt there, then re-run on SD3 for the final.
- Negative prompts help SDXL most. Listing what you do not want (extra limbs, text, watermarks) measurably cleans up results.
- Style presets are shortcuts. “Photographic”, “anime”, and “3d-model” bias the whole image without lengthening the prompt.
- Mind your credit balance. A 403 usually means you are out of credits, not that the prompt was rejected.