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Stable Assistant began as a limited beta featuring Stable Diffusion 3, then expanded into a broader creative application. Stability AI says it sunset the application on October 1, 2026; the SD3 model and Developer Platform API have separate lifecycles, and the SD 3.0 API endpoints were deprecated in 2025 and rerouted to SD3.5 equivalents.
This distinction matters if you are looking for the old app, checking a subscription, or building with Stability AI models: the app’s sunset does not mean the models or API were also discontinued.
What happened to Stable Assistant?
Stability AI’s support notice says Stable Assistant was sunset on October 1, 2026. Its still-live product page describes features, but the later support notice is the relevant source for availability. Do not assume the application remains usable based on that marketing page.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteThe notice describes subscription cancellation and refund arrangements. It says month-to-month subscriptions were automatically set to cancel September 30, 2026, with refunds for remaining subscription time after that date minus credit consumption in the final period. Annual subscribers were to receive refunds for remaining subscription time and unused September credits on September 30. Stability AI estimated refunds would take 5 to 10 business days to reach the original payment method. These are the company’s stated arrangements, not confirmation that an individual refund was completed.
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The notice does not specify how long former users’ files remain available or whether the login endpoint continues working after sunset. Contact Stability AI support with account or file-access questions; do not assume access or deletion timing.
Timeline: SD3, the API, and Stable Assistant
| Date | What happened |
|---|---|
| February 22, 2024 | Stability AI announced an early preview and waitlist for Stable Diffusion 3. |
| April 17, 2024 | Stable Diffusion 3 and SD3 Turbo became available through the Developer Platform API. The announcement also introduced Stable Assistant as a limited beta featuring SD3. |
| June 2024 | Stability AI released SD3 Medium. The company later acknowledged that the release had not met community expectations, citing issues including body poses and uncommon words. |
| April 17, 2025 | Stability AI deprecated the SD 3.0 API endpoints and said calls were rerouted to SD3.5 equivalents at no extra cost. |
| May 20, 2026 | Stability AI’s Core Models page listed SD3 Medium and several SD3.5 models, subject to Community or Enterprise agreements. |
| October 1, 2026 | Stability AI says Stable Assistant was sunset. |
How the model, API, and app differ
These are three separate things: Stable Diffusion 3 is a model family; the Developer Platform API is a service for developers; and Stable Assistant was a web application for people who wanted a ready-made creative interface. The API’s model routing and the app’s sunset are separate product events.
| What | Purpose | Current status from the researched sources |
|---|---|---|
| Stable Diffusion 3 model family | Image-generation models and weights | Stability AI’s May 2026 Core Models page listed SD3 Medium and SD3.5 models under applicable agreements. |
| Developer Platform API | Integrate image generation into software and workflows | SD 3.0 endpoints were deprecated in April 2025 and calls rerouted to SD3.5 equivalents, according to Stability AI’s API documentation. |
| Stable Assistant | Ready-made web creative application | Stability AI says it was sunset on October 1, 2026. |
What launched in April 2024?
On April 17, 2024, Stability AI announced SD3 and SD3 Turbo for its Developer Platform API, alongside a limited Stable Assistant beta featuring SD3. The hosted API let developers request image generation through the service; it was not the same thing as downloading model weights for self-hosting.
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Stability AI described SD3’s Multimodal Diffusion Transformer architecture as using separate sets of weights for image and language representations, and said this improved text understanding and spelling compared with prior Stable Diffusion versions. These are the company’s technical and performance claims, not independent benchmark findings. The April announcement also attributed 99.9% service availability to its enterprise-grade API solution delivered with Fireworks AI; treat that as a historical vendor claim, not a current service-level guarantee.
Stable Assistant later grew into a broader creative application. Its product page described image generation and editing, audio, 3D, and chat. Those details describe the app’s historical scope, not its availability after the sunset date.
What should API users do now?
Stability AI’s API documentation says SD 3.0 endpoints were deprecated on April 17, 2025, and calls were rerouted to SD3.5 equivalents at no extra cost. The current documentation presents SD3.5 as the active base-model family. Check the live API reference for the endpoint, model identifier, request parameters, pricing, and availability before building or updating an integration.
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- Check the current API reference. Do not copy an endpoint or model ID from a 2024 launch announcement.
- Confirm the model and request behavior. Verify supported parameters and the documented migration or routing behavior.
- Review current costs and terms. The researched sources do not establish a current price comparison; check live pricing and the applicable agreement.
- Test your workflow. Evaluate results for your own prompts and use case rather than relying on historical vendor claims.
Model availability and licensing
Stability AI’s May 2026 Core Models page listed SD3 Medium alongside SD3.5 models under Community or Enterprise agreements. A model’s listing does not mean Stable Assistant remains available, nor does it establish that a particular use is permitted. Stability AI’s July 2024 license announcement described free covered commercial use below USD $1 million in yearly revenue, but that historical announcement is not a substitute for the current agreement.
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Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Frequently Asked Questions
Is Stable Assistant shutting down?
Stability AI says the application was sunset on October 1, 2026. That date has passed. Its marketing page may still describe features, but the support notice is the relevant source for availability.
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What happens to Stable Assistant subscriptions and refunds?
Stability AI’s notice describes cancellation and refund arrangements for month-to-month and annual subscribers, including estimated processing times. It does not confirm whether any individual refund has been completed; contact Stability AI support about your account.
Can I still use Stable Diffusion 3 through the API?
Stability AI says the SD 3.0 API endpoints were deprecated on April 17, 2025, and calls were rerouted to SD3.5 equivalents at no extra cost. Check the current API reference for the supported endpoint and model options.
Does Stable Assistant’s sunset mean SD3 models are discontinued?
No. The app, model family, and API are separate. Stability AI’s May 2026 Core Models page listed SD3 Medium and SD3.5 models, while its API documentation describes the SD3.0-to-SD3.5 routing change.
Can I still access files from my Stable Assistant account?
The researched sunset notice does not specify post-sunset file access or deletion timing. Ask Stability AI support rather than assuming files remain accessible or have been deleted.
Is the old Stable Assistant product page proof that the app is still available?
No. The product page describes the application’s features, but Stability AI’s later support notice says it was sunset on October 1, 2026.
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