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Stability AI

AI Content Generation

Open-source generative AI company behind Stable Diffusion

Founded 2020London, UK51–200 employeesfreemium · Free planFrom Free (open-source models); API from $0.065/image (Stable Image Core); Professional $20/monthVerified · Sep 2026
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About Stability AI

Stability AI is an AI company focused on open-source generative AI models. It released Stable Diffusion, one of the most widely used open-source image generation models, as well as models for video generation (Stable Video Diffusion), 3D generation, audio, and language. By releasing weights openly, Stability AI has enabled a large ecosystem of tools, fine-tunes, and applications built on its foundation models.

Editorial Assessment

Stability AI is the company behind the open-source Stable Diffusion image generation models and a range of AI models across image, video, audio, language, and 3D generation. Founded in 2019, Stability AI gained global attention in August 2022 when it released Stable Diffusion as an open-weight model that could run locally on consumer hardware — the first time a high-quality image generation model was freely available to anyone with a GPU. This open-source distribution strategy drove massive community adoption, extensive fine-tuning, and a large ecosystem of tools (Automatic1111, ComfyUI, etc.). The company went through significant leadership turbulence in 2024: founder Emad Mostaque resigned in March 2024 amid financial difficulties, and the company appointed Prem Akkaraju as CEO. The Stability AI API provides access to Stable Diffusion 3.5, Stable Image, Stable Video, Stable Audio, and language models on a pay-as-you-go or subscription basis. The Professional tier ($20/month) provides commercial usage rights and a monthly credit allocation. The core tension in Stability AI's model is that the most popular versions of Stable Diffusion are available open-source for free — which limits paid API adoption — while the company needs commercial revenue to fund frontier model development.

Strengths
  • Open-source Stable Diffusion models (1.5, XL, 3.5) available for free local deployment
  • Largest open-source image generation ecosystem with thousands of community fine-tunes
  • Multi-modality: image, video (Stable Video Diffusion), audio (Stable Audio), 3D
  • Stable Diffusion 3.5 competitive with Midjourney and DALL-E on quality benchmarks
  • API provides commercial-use access to all models in one endpoint
  • No data training on user inputs by default
Limitations
  • Leadership instability in 2024 raised concerns about company continuity
  • The best community models (fine-tunes) require running locally or using third-party hosts
  • Stable Diffusion API pricing is per-image-step, making cost estimation complex
  • Commercial use of open-source models requires careful review of usage licenses
  • Less design-focused UI than Midjourney or Adobe Firefly

Best For

Developers building image generation into applications via API Organizations that want to run open-weight models on their own infrastructure Researchers and enthusiasts fine-tuning custom image generation models Teams needing multi-modal AI (image + audio + video) from one provider

Not Ideal For

Non-technical users wanting a consumer-friendly creative tool (Midjourney is more accessible)Organizations with concerns about Stability AI corporate stabilityApplications requiring highly consistent character generation without fine-tuning

Key Features

Stable Diffusion 3.5 (open-weight and API)Stable Diffusion XLStable Image API (Core, Ultra, SD3)Stable Video DiffusionStable Audio for music and sound effectsImage editing: search-and-replace, outpainting, upscalingTripoSG for 3D generation

Who It's For

AI developers and application buildersCreative technologistsResearchers building custom fine-tuned modelsEnterprises integrating image/video generation

Industries Served

DesignMediaGamingAdvertisingTechnology

Platforms

web api

Support

Documentation Community Discord Enterprise support

Founders

  • Emad Mostaque

Products & Tools

Stability AI APIGenerative AI API
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REST API for Stable Diffusion 3.5, Stable Image, Stable Video, and Stable Audio models on pay-as-you-go or subscription pricing.

freemium · Free planFrom Free (open-source); API from $0.065/image; Professional $20/month
Stable Diffusion 3.5Image editing APIsStable VideoStable AudioUpscaling

Sources & Verification

Last reviewed September 2026

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Stability AI FAQs

Is Stable Diffusion free?

Stable Diffusion model weights are open-source and free to download and run locally. The Stability AI API is a paid service for cloud-based image generation. Many free tools (AUTOMATIC1111, ComfyUI) are built on the open-source weights.

What is Stable Diffusion used for?

Stable Diffusion is used for text-to-image generation, image-to-image transformation, inpainting, and as a base for fine-tuned models trained on specific art styles or domains.

Tags

Open SourceStable DiffusionImage GenerationGenerative AIText-to-Image

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Official Website

stability.ai

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