Stability AI

Builds Stable Diffusion image models and Stable Audio for open-weight generative AI across visual and audio domains. CEO change in 2024 amid financial restructuring; won High Court case against Getty Images in Nov 2025 but faces other copyright litigation.

Stable Diffusion commanded 80% of AI image generation market as of 2024; open-weight approach enables local deployment and customization.

stability.ai Foundation Models - Image & Audio

United Kingdomprivate

At a glance

Total raised

$256M

last round growth

Headcount

151-200

approximate · public range

Headquarters

London

United Kingdom

Founded

2020

6 years active

Status

Private

Foundation Models - Image & Audio

Latest valuation

$1B

Growth · 2025

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Funding history

Total raised

$256M

Rounds tracked

Latest stage

Growth

Latest valuation

$1B

Date	Stage	Amount	Valuation	Lead investors
Mar 5, 2025	Growth	—	—	WPP
Jun 25, 2024	Seed	$80M	$1B	Coatue Management, Lightspeed Venture Partners, Greycroft, Sound Ventures
Nov 9, 2023	Convertible	$50M	—	Intel
May 1, 2023	Convertible	$25M	—	—
Oct 17, 2022	Seed	$101M	$1B	Coatue, Lightspeed Venture Partners, O'Shaughnessy Ventures LLC

Founder backgrounds

Cyrus Hodes

Co-Founder

Co-founded The Future Society at Harvard Kennedy School, an organization focused on AI governance. Educated at Sciences Po Paris and holds an M.A. in Defense & Geostrategy from Paris II University and an M.P.A. from Harvard Kennedy School. Served as Advisor to the UAE Minister of Artificial Intelligence and lectured in international security at the Paris School of International Affairs. Co-founded Stability AI in 2019 with Emad Mostaque. Spent full time working to develop, fundraise, market, and advance Stability AI for 18 months with minimal monetary compensation outside equity. Currently serves as Venture Partner at Lionheart Ventures and co-leads the Safety and Assurance of Generative AI project with the Global Partnership on AI, reflecting deep focus on responsible AI deployment.

AI bull / bear

Bull case

Stability AI's open-weight approach creates a powerful moat in the foundation model space. With Stable Diffusion commanding 80% of the AI image generation market as of 2024, the company has achieved category-defining distribution that closed commercial models struggle to match. The ability to deploy locally and customize models resonates with enterprises concerned about data privacy, sovereignty, and vendor lock-in—concerns that will only intensify as AI regulation matures. The November 2025 High Court victory against Getty Images provides crucial legal validation for the training methodology underpinning generative AI. This precedent strengthens Stability's position against future copyright challenges and removes a significant overhang for the entire open-source AI ecosystem. Combined with expansion into audio through Stable Audio, the company is building a multi-modal platform that can address diverse enterprise use cases. The CEO transition and financial restructuring in 2024, while disruptive, may have cleared operational debt and positioned the company for sustainable growth under new leadership.

Bear case

The 2024 CEO change and financial restructuring signal underlying business model fragility. Stability AI's open-weight ethos, while philosophically appealing, creates severe monetization challenges—users can download models once and run them indefinitely without ongoing payments. This contrasts sharply with the recurring revenue SaaS model that competitors like Midjourney and OpenAI's DALL-E leverage through API access. Despite the Getty Images win, ongoing copyright litigation creates existential risk. A single adverse ruling in remaining cases could force model retraining on licensed data, destroying economics and time-to-market advantages. The undisclosed funding history and lack of recent capital raises suggest either investor skepticism or severe dilution from down rounds during the restructuring. Meanwhile, well-capitalized competitors are rapidly closing the quality gap. Meta's open-source Llama models demonstrate that deep-pocketed players can embrace openness while maintaining financial stability through core business lines—a luxury Stability lacks. Without disclosed revenue traction or fresh capital, survival remains uncertain.

Generated by claude-sonnet-4-5-20250929 · May 1, 2026Refreshes quarterly · see disclosures

In the news

Comfy Org (official)5/21/2026
Stable Audio 3.0 Day-0 Support in ComfyUI：From Sound Effects to Longer, More Musical Tracks
Stable Audio 3.0 is available in ComfyUI with variable-length generation up to six minutes, lightweight CPU-friendly models, and commercial-use licensing.

Watch

Leadership

Emad Mostaque

Co-Founder, Former CEO

in 𝕏

Cyrus Hodes

Co-Founder

—

Prem Akkaraju

CEO

in 𝕏

Products

Stable Diffusion 3.5
Stable Diffusion is a text-to-image generative AI model that creates photorealistic images from natural language descriptions. Released in August 2022, it democratized access to image generation technology by being open-source and free, with downloads exceeding 350 million. The latest version includes improved multi-subject prompt handling, image quality, and spelling abilities. It operates via API, web interface, and downloadable models for researchers, artists, and creative professionals globally.
Stable Audio 2.5
Stable Audio 2.5 is an enterprise-grade AI music and audio generation model that creates custom-length music, sound effects, and audio tracks from text descriptions. It generates full compositions up to three minutes in stereo at 44.1 kHz quality, with advanced audio-to-audio and audio inpainting capabilities. Trained on licensed datasets with opt-out protections for creators, it serves musicians, producers, gaming studios, and advertisers seeking high-quality, customizable audio generation without copyright concerns.
Stable Video 3D
Stable Video 3D is a generative model for creating detailed three-dimensional objects and volumetric content from images or videos in seconds. Building on Stable Video Diffusion, it delivers improved quality and multi-view generation capabilities, enabling content creators to rapidly prototype 3D assets for games, films, virtual environments, and design applications. Available for both commercial and non-commercial use via API or self-hosted deployment.

Most recent patents

Stability AI Ltd·2025-11-18
Audio Generation Using Generative Artificial Intelligence Model
US12475869
Abstract
Audio Generation Using Generative Artificial Intelligence Model
US12475869
Abstract A method. The method including receiving a prompt describing desired characteristics of audio. The method further including generating, using a set of machine learning models and based on the prompt, a latent space representation of the audio at a latent rate less than 40 Hz. The method further including generating, using the set of machine learning models and the latent space representation of the audio, an audio file at an output rate greater than the latent rate. The audio file including the audio based on the latent space representation of the audio. The audio having a length greater than 90 seconds.
View on Google Patents

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