Samplers

Control the generation sampling algorithm.

Available Samplers

Sampler	Family	Speed	Quality	Notes
`euler`	FLUX, Z-Image	Fast	Good	Default for most
`euler_a`	FLUX	Fast	Good	Ancestral (random)
`dpmpp_2m`	FLUX	Medium	Better	2M solver
`heun`	FLUX	Slow	Best	High quality

Usage

curl -X POST "https://sync.render.weyl.ai/image/flux/dev/t2i?format=1024" \
  -H "Authorization: Bearer $WEYL_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "portrait",
    "sampler": "dpmpp_2m",
    "steps": 25
  }' \
  -o output.webp

Recommendations

FLUX Schnell

Use: euler (only)
Steps: 4 (fixed)
Schnell is distilled for euler at 4 steps. Other samplers won’t work.

FLUX Dev / Dev2

Fast: euler - 20-25 steps
Quality: dpmpp_2m - 25-30 steps
Best: heun - 30-40 steps

Z-Image

Use: euler (only)
Z-Image uses custom scheduling. Other samplers ignored.