Stable Diffusion 3.5 Medium

Image generationNewAvailable
by Stability AIModel ID: stable-diffusion-3-5-medium

2.5 billion parameter image model with improved MMDiT-X architecture

Price
$0.042/image
Aspect ratios
16:9, 1:1, 21:9, 2:3, 3:2, 4:5, 5:4, 9:16, 9:21
Input โ†’ output
Text โ†’ Image
Developer
Stability AI
Updated
September 24, 2026
01

Playground

Try Stable Diffusion 3.5 Medium

Input & output

$0.042/image
Try Stable Diffusion 3.5 Medium
Advanced settings (1)
Output
Your image appears here.

This run

$0.042 ยท 4.2 credits

For accounts without a purchase: runs above 2 credits need a top-up.

New here?

10 free credits ($0.10) when you sign up with Google

Usable 24 hours after sign-up, up to 5 runs per day and at most 2 credits per run. Other sign-in methods start without credits.

02

Examples

Real outputs from the public examples of this model on Replicate, with the prompt and settings that produced them. They were not generated live on this page.
  • Example output 1 from Stable Diffusion 3.5 Medium: a captivating anime-style illustration of a woman in a white astronaut suit. She has long, dark wavy hair. Surrounding the astronaut are vibOpen full size

    Prompt

    a captivating anime-style illustration of a woman in a white astronaut suit. She has long, dark wavy hair. Surrounding the astronaut are vibrant orange flowers with yellow centers. The background itself is a mesmerizing night sky filled with countless stars

    Settings

    aspect_ratio
    1:1
  • Example output 2 from Stable Diffusion 3.5 Medium: a portrait of a man standing in front of a white wall. He is looking up towards something beyond the frame, fine art photography with dappleOpen full size

    Prompt

    a portrait of a man standing in front of a white wall. He is looking up towards something beyond the frame, fine art photography with dappled light

    Settings

    aspect_ratio
    1:1
  • Example output 3 from Stable Diffusion 3.5 Medium: A photo of beautiful flowery meadow, at sunsetOpen full size

    Prompt

    A photo of beautiful flowery meadow, at sunset

    Settings

    aspect_ratio
    1:1
03

About Stable Diffusion 3.5 Medium

TL;DRAs of September 24, 2026

Stable Diffusion 3.5 Medium is a model by Stability AI in the Image generation category. On Railwail, Stable Diffusion 3.5 Medium costs $0.042 per image. Supported aspect ratios: 16:9, 1:1, 21:9, 2:3, 3:2, 4:5, 5:4, 9:16, and 9:21.

04

Pricing

Prices in US dollars. Usage is charged from prepaid credits.
Per image$0.042 per image
  • 1 credit = $0.01

Cost calculator

Price calculator

Total

$4.20

420 credits

Per run

$0.042 ยท 4.2 credits

Fixed price per run, known before the run starts.

05

API

Call Stable Diffusion 3.5 Medium with your Railwail API key. Use this model ID in the request:
stable-diffusion-3-5-mediumAPI documentationGet an API key
curl https://railwail.com/api/v1/images/generations \
  -H "Authorization: Bearer $RAILWAIL_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "stable-diffusion-3-5-medium",
    "prompt": "A lighthouse on a rocky coast at sunset, photorealistic"
  }'
Set your key as RAILWAIL_API_KEYCreate API key
06

Specifications

Model ID
stable-diffusion-3-5-medium
Developer
Stability AI
Input
Text
Output
Image
Aspect ratios
16:9, 1:1, 21:9, 2:3, 3:2, 4:5, 5:4, 9:16, 9:21
Billing
Fixed price, known before the run
Catalog entry updated
September 24, 2026

Input parameters

Inputs and settings from the model's input schema. The example in the API section shows which of them the API accepts.

  • promptrequired
    Type: Text
    Default: โ€“
    Allowed values: โ€“
  • aspectRatio
    Type: Choice
    Default: โ€“
    Allowed values: 16:9, 1:1, 21:9, 2:3, 3:2, 4:5, 5:4, 9:16, or 9:21

Tags

  • replicate
  • stability-ai
  • text-to-image
07

Use cases

08

Frequently asked questions

What is Stable Diffusion 3.5 Medium?

Stable Diffusion 3.5 Medium is a model by Stability AI in the Image generation category. On Railwail you can call it with an API key through the Railwail API.

How much does Stable Diffusion 3.5 Medium cost on Railwail?

On Railwail, Stable Diffusion 3.5 Medium costs $0.042 per image. The price is known before the run starts. Usage is paid from prepaid credits; 1 credit equals $0.01.

Which settings does Stable Diffusion 3.5 Medium support?

According to its input schema, Stable Diffusion 3.5 Medium knows these parameters: prompt and aspectRatio (16:9, 1:1, 21:9, 2:3, 3:2, 4:5, 5:4, 9:16, or 9:21).

How fast is Stable Diffusion 3.5 Medium?

There are not enough measured runs of Stable Diffusion 3.5 Medium on Railwail yet to state a run time. It depends on the input, the settings and the load at the provider.

Is Stable Diffusion 3.5 Medium better than FLUX 1.1 Pro?

That depends on the task. Stable Diffusion 3.5 Medium (Stability AI) and FLUX 1.1 Pro (Black Forest Labs) are both models in the Image generation category. The comparison page shows their prices and specifications side by side.

Compare Stable Diffusion 3.5 Medium and FLUX 1.1 Pro

How do I use Stable Diffusion 3.5 Medium through the API?

Create a Railwail API key and send your request with the model ID stable-diffusion-3-5-medium. Code examples for curl, Python and JavaScript are in the API section of this page.

09

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Use Stable Diffusion 3.5 Medium via the API

One API key for every model on Railwail. Usage is charged from prepaid credits, 1 credit = $0.01.