stability-ai/stable-diffusion-3.5-medium

Technical Specifications of stability-ai/stable-diffusion-3-5-medium

What is stability-ai/stable-diffusion-3-5-medium?

stability-ai/stable-diffusion-3-5-medium is CometAPI’s platform identifier for Stability AI’s Stable Diffusion 3.5 Medium model, an open text-to-image model built to balance image quality, prompt adherence, hardware accessibility, and customization flexibility. Stability AI describes it as a 2.5B-parameter model intended to run on consumer hardware while still supporting a broad image resolution range and modern transformer-based generation performance.

Within the Stable Diffusion 3.5 lineup, the Medium variant is aimed at users who want a more practical deployment profile than the largest flagship models, without giving up the core strengths of the SD3.5 generation family. In practice, that makes it a good fit for application builders, creative tooling, prototyping workflows, and teams that want open-model image generation with fewer infrastructure demands. This positioning is an inference based on Stability AI’s description of the model’s size, hardware profile, and customizability.

Main features of stability-ai/stable-diffusion-3-5-medium

• Balanced model size: At 2.5B parameters, the model is designed to offer a middle ground between capability and deployability, making it more accessible than larger image generation models while remaining substantially capable.
• Consumer-hardware friendly: Stability AI explicitly says Stable Diffusion 3.5 Medium is designed to run out of the box on consumer hardware, which lowers the barrier for experimentation and self-hosted adaptation.
• Improved architecture: The model uses an improved MMDiT-X architecture and updated training methods, reflecting the newer design direction of the Stable Diffusion 3.x family.
• Customization-oriented design: Stability AI emphasizes that the SD3.5 family was built with customizability as a priority, and notes transformer-block changes such as Query-Key Normalization that help stabilize training and simplify further fine-tuning.
• Flexible output resolutions: The model can generate images across a range of roughly 0.25 to 2 megapixels, which is useful for varied product, design, and content-generation workflows.
• Open release model: Stability AI presents Stable Diffusion 3.5 Medium as part of its open release strategy, with model access and associated ecosystem tooling available through public channels.
• Commercial usability under community terms: Stability AI states the model family is available for commercial and non-commercial use under the Stability AI Community License, which is important for developers evaluating adoption paths.

How to access and integrate stability-ai/stable-diffusion-3-5-medium

Step 1: Sign Up for API Key

To get started, create a CometAPI account and generate your API key from the dashboard. After signing in, store the key securely and use it to authenticate all requests to the CometAPI endpoint for stability-ai/stable-diffusion-3-5-medium.

Step 2: Send Requests to stability-ai/stable-diffusion-3-5-medium API

Use the standard CometAPI model invocation pattern, setting the model field to stability-ai/stable-diffusion-3-5-medium. Include your prompt and any supported image-generation parameters in the request body.

curl https://api.cometapi.com/v1/images/generations \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $COMETAPI_API_KEY" \
  -d '{
    "model": "stability-ai/stable-diffusion-3-5-medium",
    "prompt": "A cinematic futuristic city at sunset, ultra detailed"
  }'

Step 3: Retrieve and Verify Results

After submission, parse the API response and retrieve the generated image URLs or output objects returned by CometAPI. Verify that the result matches the requested prompt, resolution, and quality expectations before using it in production workflows.