Does upscale-model not work with sd-server?

[sxales]

I don't see anywhere in the ui to enable it and it definitely isn't activating by default.

[asadbek066]

--upscale-model is the standalone CLI upscaling path; it is not automatically applied to every sd-server generation, and the bundled UI currently does not expose that switch.

For server generation, use the high-res/upscaler flow instead:

1. Put the ESRGAN model directly in an upscaler directory.
2. Start the server with that directory:

./sd-server \
  --model /path/to/model.gguf \
  --hires-upscalers-dir /path/to/upscalers

3. Check the name the server discovered:

curl http://127.0.0.1:1234/sdapi/v1/upscalers

4. Enable it in a txt2img request using the returned model name (normally the filename stem):

{
  "prompt": "a detailed landscape",
  "width": 512,
  "height": 512,
  "steps": 20,
  "enable_hr": true,
  "hr_upscaler": "RealESRGAN_x4plus_anime_6B",
  "hr_scale": 2,
  "hr_steps": 10,
  "denoising_strength": 0.7
}

The model must be at the top level of --hires-upscalers-dir; subdirectories are not scanned. Current server code accepts .gguf, .pt, .pth, and .safetensors there.

If you only want to upscale an existing image without doing the second diffusion pass, continue using the CLI:

./sd-cli -M upscale --upscale-model /path/to/upscaler.pth -i input.png -o output.png

The current API behavior is documented in examples/server/api.md, including enable_hr, hr_upscaler, and /sdapi/v1/upscalers.