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Stable Diffusion 3.5 Medium API

by Stable Diffusion

A 2.5-billion-parameter Stable Diffusion 3.5 model balancing quality, speed, and efficiency, a great default for high-volume generation.

Get API key Read the docs

~7s
Avg. generation: 4 credits
From

stable-diffusion-3.5-medium

Image model

A sleek silver sports car on a coastal highway at sunset, hyper-realistic, golden light.

Playground

Try Stable Diffusion 3.5 Medium right here.

model: stable-diffusion-3.5-medium

Prompt

Aspect ratio

Image strength

Media inputs

Reference image

Advanced settings

Negative prompt Guidance (cfg) Steps Output format Output quality Seed

Estimated cost 4 credits · $0.04 Generate in Studio

Output

Your output lands here. Hit generate to run this request in Studio.

Pricing

Simple per-generation pricing.

4 credits per generation ≈ $0.04

You only pay for successful generations. Failed jobs are refunded automatically.
One credit balance across every model on Apiframe, no per-model plans.
Start with free credits. No subscription required.
Volume discounts on larger plans.

See plans and credit packs

Specs

At a glance.

Provider Stable Diffusion

Model ID stable-diffusion-3.5-medium

Aspect ratios 1:1, 16:9, 21:9, 3:2, 2:3, 4:5, 5:4, 9:16, 9:21

Image input Supported

Avg. time ~7s

Quickstart

How to call the Stable Diffusion 3.5 Medium API.

Send one POST /v2/images/generate request with your API key. The call returns a jobId you can poll, or pass a webhook_url and the result is pushed to you the moment it's ready.

Swap stable-diffusion-3.5-medium for any other model and nothing else changes.

Get API key Read the docs

generate.js

const response = await fetch("https://api.apiframe.ai/v2/images/generate", {
  method: "POST",
  headers: {
    "X-API-Key": "afk_your_api_key_here",
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "prompt": "a sleek silver sports car on a coastal highway at sunset, hyper-realistic",
    "model": "stable-diffusion-3.5-medium",
    "stableDiffusionParams": {
      "image": "https://example.com/input.jpg",
      "prompt_strength": 0.85,
      "negative_prompt": "What you do NOT want to see…",
      "cfg": 3.5
    }
  }),
});
const { jobId } = await response.json();
console.log(jobId);

import requests

response = requests.post(
    "https://api.apiframe.ai/v2/images/generate",
    headers={
        "X-API-Key": "afk_your_api_key_here",
        "Content-Type": "application/json",
    },
    json={
        "prompt": "a sleek silver sports car on a coastal highway at sunset, hyper-realistic",
        "model": "stable-diffusion-3.5-medium",
        "stableDiffusionParams": {
            "image": "https://example.com/input.jpg",
            "prompt_strength": 0.85,
            "negative_prompt": "What you do NOT want to see…",
            "cfg": 3.5
        }
    },
)
print(response.json())  # { "jobId": "...", "status": "QUEUED" }

curl -X POST https://api.apiframe.ai/v2/images/generate \
  -H "X-API-Key: afk_your_api_key_here" \
  -H "Content-Type: application/json" \
  -d '{
        "prompt": "a sleek silver sports car on a coastal highway at sunset, hyper-realistic",
        "model": "stable-diffusion-3.5-medium",
        "stableDiffusionParams": {
            "image": "https://example.com/input.jpg",
            "prompt_strength": 0.85,
            "negative_prompt": "What you do NOT want to see…",
            "cfg": 3.5
        }
    }'

let job;
do {
  await new Promise((r) => setTimeout(r, 2000));
  job = await fetch("https://api.apiframe.ai/v2/jobs/JOB_ID", {
    headers: { "X-API-Key": "afk_your_api_key_here" },
  }).then((r) => r.json());
} while (job.status !== "COMPLETED" && job.status !== "FAILED");
console.log(job.result);

import requests, time

while True:
    job = requests.get(
        "https://api.apiframe.ai/v2/jobs/JOB_ID",
        headers={"X-API-Key": "afk_your_api_key_here"},
    ).json()
    if job["status"] in ("COMPLETED", "FAILED"):
        break
    time.sleep(2)
print(job["result"])

curl https://api.apiframe.ai/v2/jobs/JOB_ID \
  -H "X-API-Key: afk_your_api_key_here"

Input schema

Every field Stable Diffusion 3.5 Medium accepts, with types and defaults. The full reference lives in the docs.

Field	Type	Description
prompt required	string	Text description of what to generate.
model required	string	The model identifier for this endpoint. Default:"stable-diffusion-3.5-medium" · "stable-diffusion-3.5-medium"
stableDiffusionParams.image	string (URL)	Optional image for image-to-image mode. Output matches its aspect ratio.
stableDiffusionParams.prompt_strength	number	Denoising strength for image-to-image (0–1). 1.0 ignores the input image. Default:0.85 · min 0, max 1, step 0.05
stableDiffusionParams.negative_prompt	string	Negative prompt
stableDiffusionParams.cfg	number	How strictly to follow the prompt. Default:3.5 · min 0, max 20, step 0.1
stableDiffusionParams.steps	number	Steps Default:28 · min 1, max 40, step 1
stableDiffusionParams.output_format	string	Output format Default:"webp" · "webp", "jpg", "png"
stableDiffusionParams.output_quality	number	Output quality Default:90 · min 0, max 100, step 1
stableDiffusionParams.seed	number	Reuse a number to reproduce the same result. step 1