Introduction

If your asset pipeline calls Stability AI's 3D API, you now have a deadline: December 10, 2026. Comfy

that it's taking over Stability AI's Image Services and 3D APIs, and Stability's customer notice says those endpoints "will no longer be available directly on the Stability AI API platform" after that date. The same routes are already live on Comfy's compatibility endpoint at https://stability.comfy.org. You can switch today.

For game devs, the part that matters is the two 3D routes: Stable Fast 3D and Stable Point Aware 3D (SPAR3D), the single-image-to-mesh models plenty of prop and prototype pipelines rely on.

What shipped

  • Models: Stable Fast 3D and Stable Point Aware 3D, plus Stable Image Core/Ultra, SD3.5, SDXL and the edit, control and upscale routes
  • Vendor: Stability AI models, now served by Comfy
  • Modality: image-to-3D (and image gen/edit)
  • Open vs API: this is the hosted API. Self-hosting stays a separate path under Stability's Self-Hosted License
  • Where to run it today: https://stability.comfy.org with a Comfy Platform API key (migration page)
  • Concrete fact: the 3D routes are /v2beta/3d/stable-fast-3d and /v2beta/3d/stable-point-aware-3d, same paths and parameters as before

What changes in your code

Comfy says to keep your request paths, parameters and response handling. Only two things change:

  1. Base URL: https://api.stability.ai becomes https://stability.comfy.org
  2. Auth: a Comfy API key sent as Authorization: Bearer. The compatibility endpoint doesn't accept the X-API-Key header

A Stable Fast 3D call from a build script now looks like this:

curl -f -sS "https://stability.comfy.org/v2beta/3d/stable-fast-3d" \
  -H "Authorization: Bearer $COMFY_API_KEY" \
  -F image=@"./prop_concept.png" \
  -o "./prop_concept.glb"

There's no automatic redirect, so any tool still pointed at the old host will just start failing after the cutoff. Search your repo, your DCC plugins and any CI jobs for api.stability.ai.

Account and billing details

  • Create a key in the Comfy workspace you want billed, then add credits there (minimum top-up is $5).
  • Stability says pricing for image and 3D endpoints stays the same after the move.
  • Your remaining Stability credits don't transfer. They still work for the Stable Audio API, which stays with Stability. Stability recommends using up any credits you bought for image and 3D before December 10.
  • Comfy mentions a 30-day grace period after go-live and tells you to confirm the dates in Stability's notice.

The catch

Not every route made the move. Async-only routes like Creative Upscale (/v2beta/stable-image/upscale/creative), results polling, /v1/user/*, /v1/engines/list and the other v1 engines aren't supported. SD3 generation only accepts sd3.5-* models and wants samples=1. If your texture or concept pipeline polls for async jobs, you'll need to change that, not just the URL.

The 3D side looks straightforward: both routes are on the supported list. Still, run one prop through the new host before you change a production config, then compare the GLB to what you got before.

—Titus