Stability AI Not Working?
404 deprecated endpoint, image dimension errors, content filter blocking your prompt, credits exhausted, or API key invalid? Fix Stable Diffusion API issues step by step.
Stability AI — live status
Updated every 5 minutes. Full history at prismix.dev/service/stability.
What's wrong? Diagnose fast
HTTP 404 on API endpoint
Legacy v1/v1beta generation API is deprecated. Migrate to v2beta Stable Image API. New endpoint: api.stability.ai/v2beta/stable-image/generate/core (or /sd3 for SD 3.5).
Dimension / size error
SD3.5 and Stable Image use aspect_ratio parameter (not width/height). Accepted values: 16:9, 1:1, 21:9, 2:3, 3:2, 4:5, 5:4, 9:16, 9:21. Do not pass width/height for v2beta.
Content filter blocking prompt
Mandatory NSFW filter. Remove anatomical terms, violence descriptors, or suggestive wording. Add "cinematic, professional" style terms. Use negative prompt: "nsfw, explicit, violence".
Credits exhausted (402 error)
Check balance at platform.stability.ai → Billing. Stable Image Core: 3 credits/image. SD 3.5 Medium: 3.5 credits. SD 3.5 Large: 6.5 credits. Purchase add-on credits or upgrade plan.
API key invalid (401 error)
Regenerate your API key at platform.stability.ai/account/keys. For v2beta, use header "Authorization: Bearer sk-..." (not Basic auth). Keys from DreamStudio are separate from Platform keys.
DreamStudio not loading
dreamstudio.ai is Stability AI's consumer product separate from the API. If DreamStudio is slow or not generating images, check prismix.dev/service/stability. Clear browser cache and try in incognito.
API migration: v1 → v2beta Stable Image
| Feature | v1 (deprecated) | v2beta (current) |
|---|---|---|
| Text-to-image | /v1/generation/{model}/text-to-image | /v2beta/stable-image/generate/core |
| SD 3.5 text-to-image | Not available | /v2beta/stable-image/generate/sd3 |
| Image-to-image | /v1/generation/{model}/image-to-image | /v2beta/stable-image/generate/core (add init_image) |
| Upscale | /v1/generation/esrgan-v1-x2plus/image-to-image/upscale | /v2beta/stable-image/upscale/conservative |
| Auth header | Authorization: Bearer sk-... | Authorization: Bearer sk-... |
| Dimensions | width + height (must be multiples of 64) | aspect_ratio string (e.g. "16:9") |
| Response format | JSON with base64 artifacts[] | Binary (PNG) or multipart (JSON with base64 image) |
Stability AI credit costs per model
| Model / Endpoint | Credits per image | Notes |
|---|---|---|
| Stable Image Core | 3 | Fastest, good quality |
| SD 3.5 Medium | 3.5 | Balanced quality/speed |
| SD 3.5 Large | 6.5 | Best quality |
| SD 3.5 Large Turbo | 4 | Fast high-quality |
| Stable Image Ultra | 8 | Highest detail, slower |
| Conservative Upscale | 25 | Per upscale operation |
Credits do not expire. 1 USD ≈ 100 credits. New accounts get ~25 free credits. Purchase additional credits at platform.stability.ai.
Step-by-step fix
- 1
Check live status
Visit prismix.dev/service/stability. If the status shows degraded, all API requests will be affected — wait for recovery before debugging your code.
- 2
Migrate from v1/v1beta to v2beta
Replace your endpoint URL. Old:
api.stability.ai/v1/generation/stable-diffusion-xl-1024-v1-0/text-to-image. New:api.stability.ai/v2beta/stable-image/generate/core. Change the request body: remove width/height fields; addaspect_ratio: "16:9". For SD 3.5: use/v2beta/stable-image/generate/sd3withmodel: "sd3.5-large". - 3
Fix dimension errors
For v2beta endpoints: do NOT send width or height. Instead send
aspect_ratio: "16:9"(landscape),"1:1"(square), or"9:16"(portrait). The API resolves to a supported pixel dimension internally. Valid aspect ratios: 16:9, 1:1, 21:9, 2:3, 3:2, 4:5, 5:4, 9:16, 9:21. - 4
Fix content filter rejections
Remove problematic terms from your prompt. Common trigger words: body part names (even medical), weapon names, violence-related adjectives. Add to your prompt: "professional photography, safe for work, cinematic". Add negative prompt: "nsfw, explicit, violent, gore, inappropriate". The v2beta API returns a 400 error with a content filter message when triggered.
- 5
Fix API key issues
API keys from DreamStudio and from the Stability AI Developer Platform are different. For the v2beta API, get your key from
platform.stability.ai/account/keys. The auth header format isAuthorization: Bearer sk-.... Do not use Basic auth (that was v1). - 6
Fix credits exhausted (402 error)
HTTP 402 Payment Required means your credit balance is zero. Check your balance at
platform.stability.ai→ Billing. Credits are purchased at $10 for ~1,000 credits (the exact price per credit decreases at higher volumes). Credits do not expire. Add credits atplatform.stability.ai/account/credits.
Get alerted when Stability AI goes down
Star Stability AI on Prismix and get emailed the moment status changes. Also monitor Midjourney, DALL-E, and Ideogram. Free.
Frequently asked questions
Why is Stability AI not working?
Common causes: 404 = deprecated v1 endpoint (migrate to v2beta Stable Image API); 400 with dimension error = use aspect_ratio instead of width/height; content filter block = rephrase prompt (remove suggestive/violent terms); 402 = credits exhausted (check platform.stability.ai billing); 401 = API key invalid (regenerate at platform.stability.ai).
Is Stability AI down right now?
Check prismix.dev/service/stability for live status. The image generation API and DreamStudio have independent uptime.
Stability AI 404 error — deprecated endpoint, how to fix?
Migrate to the v2beta Stable Image API: POST https://api.stability.ai/v2beta/stable-image/generate/core for text-to-image. For SD 3.5: POST /v2beta/stable-image/generate/sd3 with model: "sd3.5-large". Use aspect_ratio instead of width/height. Auth is still "Authorization: Bearer sk-...".
Stability AI content filter blocking my prompt — how to fix?
The mandatory NSFW filter cannot be disabled. Remove anatomical terms, weapon names, violence references. Add "professional, cinematic, safe" to your prompt style. Add negative prompt: "nsfw, explicit, violent, inappropriate". For unrestricted local generation, use Automatic1111 or ComfyUI self-hosted.
Stability AI credits not working — how to check balance?
Check balance at platform.stability.ai → Billing. HTTP 402 = zero credits. Credits: Stable Image Core (3/image), SD 3.5 Medium (3.5), SD 3.5 Large (6.5). Purchase at platform.stability.ai/account/credits. Credits do not expire.
