stability-ai/fast-sdxl

Name: Stable Diffusion XL
Author: Stability AI

Fast Sdxl is Stability AI's advanced text-to-image AI model. Create photorealistic images, illustrations, and concept art from natural language descriptions with exceptional detail and prompt adherence.

Input

Prompt(string)

The prompt to use for generating the image. Be as descriptive as possible for best results.

Aspect Ratio(string)

The aspect ratio of the generated image. Allowed values: 21:9, 16:9, 3:2, 4:3, 5:4, 1:1, 4:5, 3:4, 2:3, 9:16.

Seed(integer)

The same seed and the same prompt given to the same version of Stable Diffusion will output the same image every time.

Loras(array)

Enter a JSON array.

Guidance Scale(number)

020

Range: 0 to 20.

Num Inference Steps(integer)

150

Range: 1 to 50.

Idle

Example output — click Run to generate your own

Production endpoint

Send your first request

OpenAI-compatible endpoint with unified authentication and usage tracking.

POSThttps://api.sandbase.ai/v1/run

Model IDstability-ai/fast-sdxl

Input Schema

6 parameters · 1 required · 5 optional

Parameter	Type	Required	Description
`prompt`	string	Required	The prompt to use for generating the image. Be as descriptive as possible for best results.
`seed`	integer	Optional	The same seed and the same prompt given to the same version of Stable Diffusion will output the same image every time. · Default: null
`loras`	array	Optional	Default: []
`aspect_ratio`	string	Optional	The aspect ratio of the generated image. · Options: 21:9, 16:9, 3:2, 4:3, 5:4, 1:1, 4:5, 3:4, 2:3, 9:16 · Default: "16:9" 21:916:93:24:35:41:14:53:42:39:16
`guidance_scale`	number	Optional	Min: 0 · Max: 20 · Default: 7.5
`num_inference_steps`	integer	Optional	Min: 1 · Max: 50 · Default: 25

Output Schema

Field	Type	Description
`id`	string	Unique identifier for the generation task
`status`	string	Task status: pending, running, completed, failed, timeout
`model`	string	Model used for the generation
`outputs`	array	Array of output items
`outputs[].url`	string	URL of the generated artifact
`outputs[].content_type`	string	MIME type (e.g. image/png, video/mp4)
`error`	object \| null	Error details if failed, null on success
`error.type`	string	Machine-readable error type code
`error.message`	string	Human-readable error description

Async Workflow

This model uses asynchronous execution. Submit a request and poll for the result.

Submit — POST to /v1/run, receive an id
Poll — GET /v1/run/{id} until status is completed, failed, or timeout
Retrieve — Read outputs from the completed response

Code Examples

Ready-to-run snippets

# Step 1: Submit
curl -X POST https://api.sandbase.ai/v1/run \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
  "model": "stability-ai/fast-sdxl",
  "seed": null,
  "loras": [],
  "prompt": "photo of a rhino dressed suit and tie sitting at a table in a bar with a bar stools, award winning photography, Elke vogelsang",
  "aspect_ratio": "16:9",
  "guidance_scale": 7.5,
  "num_inference_steps": 25
}'

# Step 2: Poll result (replace <id>)
curl https://api.sandbase.ai/v1/run/<id> \
  -H "Authorization: Bearer YOUR_API_KEY"

← Back to Stable Diffusion XL

API README

Stable Diffusion XL

Stable Diffusion XL occupies a clearly bounded position in a image production pipeline under the route stability-ai/fast-sdxl. It is best evaluated as a named workflow endpoint rather than as a generic substitute for neighboring versions: planners can assign the route to a specific brief, record the chosen revision, and keep approval history tied to one predictable integration surface from intake through delivery.

A practical rollout of Stable Diffusion XL should begin with source-readiness checks, ownership of the submitted material, an agreed budget, and a written definition of the final fast sdxl deliverable. Before automation is enabled, the acceptance pass should verify that the returned asset opens correctly, fits the intended downstream toolchain, satisfies the project’s review criteria, and can be reproduced from the stored request and route identity stability-ai/fast-sdxl.

Highlights

Distinct output behavior. For Stable Diffusion XL, for Stable Diffusion XL, create without a starting image; the written prompt is the only required field In Stable Diffusion XL, this capability is applied through the exact stability-ai/fast-sdxl workflow with seed as a relevant request control; the seed control exposes the corresponding choice in this route; the seed control exposes the corresponding choice in this route.
Creative control. For Stable Diffusion XL, for Stable Diffusion XL, pass an array of LoRA weights when the generation needs those adapters In Stable Diffusion XL, this capability is applied through the exact stability-ai/fast-sdxl workflow with loras as a relevant request control; the loras control exposes the corresponding choice in this route; the loras control exposes the corresponding choice in this route.
Workflow fit. For Stable Diffusion XL, for Stable Diffusion XL, select among ten landscape, square, and portrait ratios In Stable Diffusion XL, this capability is applied through the exact stability-ai/fast-sdxl workflow with prompt as a relevant request control; the prompt control exposes the corresponding choice in this route; the prompt control exposes the corresponding choice in this route.
Production detail. For Stable Diffusion XL, for Stable Diffusion XL, set both guidance and the number of inference steps within their declared bounds In Stable Diffusion XL, this capability is applied through the exact stability-ai/fast-sdxl workflow with aspect ratio as a relevant request control; the aspect ratio control exposes the corresponding choice in this route; the aspect ratio control exposes the corresponding choice in this route.

Pricing

Configuration	Price
Per request	$0.00125

When to Use

Scenario	Why this model fits
Choose Stable Diffusion XL	Use it when the required deliverable is specifically the image result documented for `stability-ai/fast-sdxl`.
Match the source material	Select this route when your inputs naturally map to `seed`, `loras`, `prompt`, `aspect_ratio`.
Use its distinguishing capability	For Stable Diffusion XL, create without a starting image; the written prompt is the only required field In Stable Diffusion XL, this capability is applied through the exact stability-ai/fast-sdxl workflow with seed as a relevant request control; the seed control exposes the corresponding choice in this route
Plan repeatable production	For Stable Diffusion XL, pass an array of LoRA weights when the generation needs those adapters In Stable Diffusion XL, this capability is applied through the exact stability-ai/fast-sdxl workflow with loras as a relevant request control; the loras control exposes the corresponding choice in this route
Confirm cost and delivery	Use the pricing combinations below and the output contract above when budgeting or automating Stable Diffusion XL jobs.

Prompt Guide

Build the request around the exact stability-ai/fast-sdxl schema. Start with required fields, then add only the controls needed for the intended output; keep URLs reachable and enum values exactly as shown in Technical Specs.

{
  "prompt": "photo of a rhino dressed suit and tie sitting at a table in a bar with a bar stools, award winning photography, Elke vogelsang",
  "seed": 0,
  "loras": [],
  "aspect_ratio": "16:9"
}

Technical Specs

Specification	Value
Model ID	`stability-ai/fast-sdxl`
Execution mode	`async`
Required inputs	`prompt`
Request fields	`seed` (integer, optional); `loras` (array, optional); `prompt` (string, required); `aspect_ratio` (string, optional, options: 21:9 / 16:9 / 3:2 / 4:3 / 5:4 / 1:1 / 4:5 / 3:4 / 2:3 / 9:16); `guidance_scale` (number, optional, min 0, max 20); `num_inference_steps` (integer, optional, min 1, max 50)
Output	`url` (string); `content_type` (string)