models/Stability AI/Stable Diffusion 3.5 Medium
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Stable Diffusion 3.5 Medium

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Stable Diffusion 3.5 Medium is a Multimodal Diffusion Transformer (MMDiT) text-to-image model that features improved performance in image quality, typography, complex prompt understanding, and resource-efficiency.

MODALITIES
image
PER IMAGE
$0.020

Stable Diffusion 3.5 Medium (stability-ai/stable-diffusion-v35-medium) is a image model from Stability AI. Pricing via AIgateway: $0.020 per image. Call it via https://api.aigateway.sh/v1/images/generations — set model="stability-ai/stable-diffusion-v35-medium".

model · stability-ai/stable-diffusion-v35-medium

Use this model

model: stability-ai/stable-diffusion-v35-medium
curl https://api.aigateway.sh/v1/images/generations \
  -H "Authorization: Bearer $AIGATEWAY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"stability-ai/stable-diffusion-v35-medium","prompt":"a serene cyberpunk city at dusk"}'
API schema

Call Stable Diffusion 3.5 Medium from any OpenAI SDK

POST https://api.aigateway.sh/v1/images/generations·Content-Type: application/json·Auth: Bearer sk-aig-...

Request body

json
{
  "model": "stability-ai/stable-diffusion-v35-medium",
  "prompt": "A cyberpunk cat at sunset, cinematic lighting",
  "n": 1,
  "size": "1024x1024",
  "response_format": "url"   // or "b64_json"
}

Response

json
{
  "created": 1776947082,
  "data": [
    { "url": "https://media.aigateway.sh/img/abc123.png" }
    // or { "b64_json": "iVBORw0KGgoAAAANSUhEU..." }
  ]
}

Quickstart

from openai import OpenAI
client = OpenAI(base_url="https://api.aigateway.sh/v1", api_key="sk-aig-...")

r = client.images.generate(
    model="stability-ai/stable-diffusion-v35-medium",
    prompt="a cyberpunk cat at sunset",
    size="1024x1024",
)
print(r.data[0].url)

Errors

401authentication_errorInvalid or missing API key
402insufficient_creditsWallet empty (PAYG only)
404not_foundUnknown model or endpoint
429rate_limit_errorOver per-minute limit — see Retry-After header
500server_errorUpstream provider failed (retryable)
503service_unavailableUpstream saturated (retryable)
Full docs →API reference →OpenAPI spec →llms.txt →

Frequently asked questions

What is Stable Diffusion 3.5 Medium?
Stable Diffusion 3.5 Medium is a Multimodal Diffusion Transformer (MMDiT) text-to-image model that features improved performance in image quality, typography, complex prompt understanding, and resource-efficiency. It is a image model from Stability AI, accessible via AIgateway's OpenAI-compatible API at slug stability-ai/stable-diffusion-v35-medium.
How much does Stable Diffusion 3.5 Medium cost via AIgateway?
$0.0200 per image, billed pass-through.
How do I call Stable Diffusion 3.5 Medium from my code?
Point the OpenAI SDK at https://api.aigateway.sh/v1 with your AIgateway key and set model to "stability-ai/stable-diffusion-v35-medium". The request and response shapes match OpenAI exactly.
Does Stable Diffusion 3.5 Medium support streaming, tool calling, vision, and JSON mode?
Streaming — no. Tool calling — no. Vision — no. JSON mode — no. Prompt caching — no.
Can I bring my own Stability AI API key (BYOK)?
Yes. Attach a Stability AI key in your AIgateway dashboard and this model flips to pass-through — you pay Stability AI directly and AIgateway adds no platform fee on those calls.