Stability AI Release Notes

May 20, 2026

Today we are releasing an API for Stable Audio 3.0, our most advanced AI audio generation model that produces high-quality, coherent musical tracks up to six minutes long at 44.1kHz stereo. Introducing groundbreaking audio-to-audio capabilities, Stable Audio 3.0 enables users to upload and transform audio samples using natural language prompts.

Read more about the model capabilities here.

Stable Audio 3.0 was exclusively trained on licensed data from the AudioSparx music library, honoring opt-out requests and ensuring fair compensation for creators.

Try Stable Audio 3.0 for free at stableaudio.com.

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July 24, 2025

We have made a few changes to our API services. These changes will help us maintain high-quality service while investing in new capabilities that benefit our users.

Service deprecations: We will no longer support the following API endpoints, effective July 24:

• Stable Video Diffusion API
• Stable Diffusion 1.6 API

Pricing updates: We've increased the pricing for select API services, effective August 1. See more details here.

For users currently using the SD1.6 API, we recommend migrating to Stable Diffusion XL, which offers significantly improved output quality while maintaining the same pricing structure as SD1.6.

We also encourage taking this opportunity to upgrade to the latest tools. The Stability AI API has a range of additional image generation offerings to explore:

• Stable Image Core: Optimized for fast and affordable image generation, Stable Image Core is the next-generation model following SDXL.
• Stable Image Ultra: Our state-of-the-art text to image model based on Stable Diffusion 3.5. …

April 17, 2025

As of April 17, 2025, we are deprecating the Stable Diffusion 3.0 APIs and automatically upgrading to Stable Diffusion 3.5 APIs at no extra cost.

Transitioned Models:

• sd3-large -> sd3.5-large
• sd3-large-turbo -> sd3.5-large-turbo
• sd3-medium -> sd3.5-medium

Here's what you need to know:

• Higher-quality images: Stable Diffusion 3.5 offers top-tier performance in prompt adherence and image quality. You can learn more about the model here.
• No action needed: Your API calls will be automatically transitioned.
• Same pricing: You'll get improved quality at no extra cost. See price list here.

Additional Image Models:

We have a wide range of image generating models on the Stability AI API:

• Stable Image Ultra: Our highest-quality model, powered by SD3.5 Large ($0.08/image), we'd encourage you to try it!
• Stable Image Core: Optimized for speed and cost-efficiency ($0.03/image).

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April 1, 2025

Today we are releasing Style Transfer on the Stability AI API. This feature allows users to apply visual aesthetics from one image to another by uploading a reference style image and a target image.

Unlike our Style Guide API, which extracts stylistic elements from an input image (control image) and uses it to guide the creation of an output image based on the prompt, Style Transfer specifically applies styling from one existing image to another existing image without generating new content.

Style Transfer helps maintain brand consistency, unify visual content, and design prototyping. It streamlines the implementation of visual guidelines and facilitates experimentation with different aesthetic directions.

As always, all of our APIs come with standard safety features for input filtering, NSFW filtering of input images and generated content, known CSAM content filtering through Thorn, and C2PA signing.

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March 21, 2025

Today we are releasing an API for Stable Audio 2.0, our most advanced AI audio generation model that produces high-quality, coherent musical tracks up to three minutes long at 44.1kHz stereo. Introducing groundbreaking audio-to-audio capabilities, Stable Audio 2.0 enables users to upload and transform audio samples using natural language prompts.

Read more about the model capabilities here.

Stable Audio 2.0 was exclusively trained on licensed data from the AudioSparx music library, honoring opt-out requests and ensuring fair compensation for creators.

Try Stable Audio 2.0 for free at stableaudio.com.

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January 08, 2025

Today we are releasing Stable Point Aware 3D (SPAR3D), a 3D generative AI model that introduces the ability to make real-time edits and create the complete structure of a 3D object from a single image in a few seconds. Introducing a first-of-its-kind two-stage architecture, SPAR3D enables unparalleled control over 3D object generation.

Compared to our previous model Stable Fast 3D, this new one allows editing of backside information using the point cloud representation and also leverages a larger Diffusion model to generally improve the depth and backside predictions.

Read more about the model capabilities here.

This API is currently in preview. Please don’t hesitate to contact us with any questions.

As always, all of our APIs come with standard safety features for input filtering, NSFW filtering of input images and generated content, known CSAM content filtering through Thorn, and C2PA signing.

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November 07, 2024

We are pleased to announce our newest Edit API, Replace Background and Relight. This service enables you to replace the background of your images. Additionally, we have updates to our flagship Stable Image Ultra service and the SD3 & 3.5 service.

New

• Edit Replace Background & Relight: The Replace Background and Relight service lets users swap backgrounds with AI-generated or uploaded images while adjusting lighting to match the subject. This new API provides a streamlined image editing solution and can serve e-commerce, real estate, photography, and creative projects.

  Some of the things you can do include:

  • Background Replacement: Remove existing background and add new ones.
  • AI Background Generation: Create new backgrounds using AI generated images based on prompts.
  • Relighting: Adjust lighting in images that are under or overexposed.
  • Flexible Inputs: Use your own background image or generate one.
  • Lighting Adjustments: Modify light reference, direction, and strength.

Updated

• Stable Image Ultra: Stable Image Ultra now supports image-to-image. …

October 29, 2024

Today we are releasing a new model in the Stable Diffusion 3.5 suite on our API, our most powerful base models yet, and an update to our flagship Stable Image Ultra service:

• Stable Diffusion 3.5 Medium: With 2.5 billion parameters, the model delivers an optimal balance between prompt accuracy and image quality, making it an efficient choice for fast high-performance image generation.

• Stable Image Ultra: Following the release of the Stable Diffusion 3.5 model suite, we are updating the Stable Image Ultra API with Stable Diffusion 3.5 Large, our largest and most powerful base model yet. Stable Image Ultra is our flagship image service, offering the highest quality and detail.

Read more about the model capabilities here.

New

• Stable Diffusion 3.5 Medium: This endpoint now supports sd3.5-medium in the model parameter, allowing you to generate images with SD 3.5 Medium.

Updated

• Stable Image Ultra: Stable Image Ultra is now powered by Stable Diffusion 3.5 Large.

As always, all of our APIs come with standard safety features for input filtering, NSFW filtering of input images and generated content, known CSAM content filtering through Thorn, and C2PA signing.…

October 22, 2024

Today we are releasing Stable Diffusion 3.5 on our API, our most powerful base models yet:

• Stable Diffusion 3.5 Large: At 8 billion parameters, with superior quality and prompt adherence, this base model is the most powerful in the Stable Diffusion family. This model is ideal for professional use cases at 1 megapixel resolution.

• Stable Diffusion 3.5 Large Turbo: A distilled version of Stable Diffusion 3.5 Large. SD3.5 Large Turbo generates high-quality images with exceptional prompt adherence in just 4 steps, making it considerably faster than Stable Diffusion 3.5 Large.

Read more about the model capabilities here.

New

• Stable Diffusion 3.5: This endpoint now supports sd3.5-large and sd3.5-large-turbo in the model parameter, allowing you to generate images with SD3.5 Large and SD3.5 Large Turbo.

As always, all of our APIs come with standard safety features for input filtering, NSFW filtering of input images and generated content, known CSAM content filtering through Thorn, and C2PA signing.

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September 10, 2024

We are excited to release our newest Upscale API, Fast Upscaler. This service enhances image resolution by 4x using predictive and generative AI. This lightweight and fast service (processing in ~1 second) is ideal for enhancing the quality of compressed images, making it suitable for social media posts and other applications.

How does the Fast Upscaler compare to our other Upscale Services?

The Fast Upscaler offers a more affordable and quicker alternative to the Conservative Upscaler which can upscale images by 20 to 40 times to a 4 megapixel output image. The Conservative Upscaler can upscale images as small as 64x64 pixels directly to a 4 megapixel output. Use this option if you directly need a 4 megapixel output.

If you wish to upscale highly degraded images (lower than 1 megapixel) with a creative twist, we recommend trying the Creative Upscaler.

New

• Fast Upscaler: Simple, low-cost upscaler used to increase image resolution by 4x, up to 4 megapixels. …

August 19, 2024

We are pleased to announce our newest Edit API, Search and Recolor. This service enables you to quickly change the color of a specific object in an image using a prompt.

New

• Edit Search and Recolor: The Search and Recolor service allows to change the color of a specific object in an image using a prompt. This service is a specific version of inpainting that does not require a mask. The Search and Recolor service will automatically segment the object and recolor it using the colors requested in the prompt.

Updated

• Stable Fast 3D: There is a new parameter, remesh, available which enables the use of the triangle remeshing algorithm during 3D model generation.

As always, all of our APIs come with standard safety features for input filtering, NSFW filtering of input images and generated content, known CSAM content filtering through Thorn, and C2PA signing.

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August 1, 2024

We are excited to introduce Stable Fast 3D, Stability AI’s latest breakthrough in 3D asset generation technology. This innovative model transforms a single input image into a detailed 3D asset, setting a new standard for speed and quality in the field of 3D reconstruction.

New

• Stable Fast 3D: The Stable Fast 3D API generates high-quality 3D assets from a single image in just 0.5 seconds. The model has applications for game and virtual reality developers, as well as professionals in retail, architecture, design and other graphic-intense professions. Stable Fast 3D rapidly generates a complete 3D asset, including:
  • UV unwrapped mesh
  • Material parameters
  • Albedo colors with reduced illumination bake-in
  • Optional quad or triangle remeshing (adding only 100-200ms to processing time)

As always, all of our APIs come with standard safety features for input filtering, NSFW filtering of input images and generated content, known CSAM content filtering through Thorn, and C2PA signing.

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May 20, 2024

Today we are pleased to announce two new services, Erase Object and Conservative Upscale. These new endpoints enable exciting new workflows. Additionally, we have made enhancements to Outpaint.

New

• Erase Object: The Erase Object service removes unwanted objects, such as blemishes on portraits or items on desks.
• Conservative Upscale: This service takes images between 64x64 pixels and 1 megapixel and upscales them all the way to 4K resolution. Put more generally, it can upscale images ~20-40x times while preserving all aspects. Conservative Upscale minimizes alterations to the image and should not be used to reimagine an image.

Updated

• Outpaint: Now supports outpainting up to 2000 pixels in any direction (up from 512 px) and a new creativity parameter which controls the likelihood of creating additional details not conditioned by the initial image.

As always, all of our APIs come with standard safety features for input filtering, NSFW filtering of input images and generated content, known CSAM content filtering through Thorn, C2PA signing, and Watermarking.

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April 30, 2024

We are excited to announce two new services, Control Sketch and Control Structure. These are the first in our suite of Control related services. Additionally, we have made improvements to Outpaint and Creative Upscale.

New

• Control Sketch: This service offers an ideal solution for design projects that require brainstorming and frequent iterations. It upgrades rough hand-drawn sketches to refined outputs with precise control. For non-sketch images, it allows detailed manipulation of the final appearance by leveraging the contour lines and edges within the image. Check out the docs to learn more.
• Control Structure: This service excels in generating images by maintaining the structure of an input image, making it especially valuable for advanced content creation scenarios such as recreating scenes or rendering characters from models. Check out the docs to learn more.

Updated

• Outpaint: Significantly improved coherence and diversity in the outpainted image area. Fixed a bug where some down outpaint tasks failed.
• Creative Upscale: Significantly faster outputs and improved quality in photorealism. Improved diversity in non-photorealistic outcomes. …

March 21st, 2024

This release note covers:

• Stable Image Services
• Stable Video
• REST API v2beta and legacy

Stable Image

We are proud to announce Stable Image Services, Stability AI’s new flagship suite of API services for image. Stable Image offers the best-in-class experience for developers building products in the design space, and is categorized into four sets:

• Generate: The premium image generation services. This includes the new flagship Stable Image Core service, which leverages the latest models. Older simple model services of SDXL 1.0 and SD 1.6 are also represented in this category. Stay tuned for Stable Diffusion 3 to be added to this category as well.
• Upscale: The best image enhancement services. This includes the Creative Upscaler as well legacy ESRGAN upscaler.
• Edit: The ideal services for inpainting, outpainting and similar image editing tools. Includes the new Search and Replace service that enables natural language image editing.
• Control: The premium image-to-image service that leverages advanced models like Controlnets. Perfect for advanced users that want precise control over image generation.

These services are in early release, and are being constantly updated. All services are available in the new REST v2beta API.

Stable Video …