Stable Diffusion 3 Medium

Stability AI recently released the weights for Stable Diffusion 3 Medium, a 2 billion parameter text-to-image model that excels at photorealism, typography, and prompt adherence.

Now you can run the official Stable Diffusion 3 Medium model on Novita AI.

You can try this model at the Playground, or integrate it into your product using the Text to Image API and Image to Image API.

API Request Example

curl --location 'https://api.novita.ai/v3/async/txt2img' \
--header 'Authorization: Bearer {{API Key}}' \
--header 'Content-Type: application/json' \
--data '{
    "extra": {
        "response_image_type": "jpeg"
    },
    "request": {
        "model_name": "sd3_base_medium.safetensors",
        "prompt": "A heart logo with the text \"Novita AI\" on it",
        "width": 1024,
        "height": 1024,
        "image_num": 1,
        "steps": 28,
        "seed": -1,
        "clip_skip": 1,
        "guidance_scale": 4.5,
        "sampler_name": "FlowMatchEuler"
    }
}'

Please Note

1. Currently, only the checkpoint sd3_base_medium.safetensors is available for Stable Diffusion 3, and no LoRAs or ControlNets are supported.
2. You can only use the sampler FlowMatchEuler for Stable Diffusion 3.

Best Practices for Stable Diffusion 3

1. The longer and more complex the prompt, the more likely something will be missing.
2. Please avoid using negative prompts, as they are ineffective.
3. Suggested parameters:
   • Steps: Use around 28 steps.
   • Guidance Scale: Set between 3.5 and 4.5 for balanced adherence and image quality.
   • Resolution: Use resolutions around 1 megapixel, ensuring they are divisible by 64.