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FLUX Models

Family: flux
Creator: Black Forest Labs
Modality: Image generation

State-of-the-art text-to-image models from the creators of Stable Diffusion.

Model Variants

FLUX.2 Dev (dev2)

32B parameter model with Mistral-3 24B text encoder

Terminal window
curl -X POST "https://sync.render.weyl.ai/image/flux/dev2/t2i?format=1024" \
  -H "Authorization: Bearer $WEYL_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "portrait in natural light",
    "guidance": 3.5,
    "steps": 25
  }' \
  -o output.webp

Characteristics:

  • Best prompt understanding
  • Excellent fine detail
  • ~2.4s @ 1024px on nunchaku

Guidance Tuning:

  • Short prompts: guidance: 3.5
  • Detailed prompts: guidance: 1.5

FLUX.1 Dev (dev)

12B parameter model with T5-XXL encoder

Characteristics:

  • Excellent quality/speed balance
  • Strong baseline model
  • ~1.8s @ 1024px on nunchaku

Guidance: Standard guidance: 3.5

FLUX.1 Schnell (schnell)

12B distilled model, optimized for 4 steps

Characteristics:

  • Fastest FLUX variant
  • Fixed 4 steps
  • ~450ms @ 1024px on nunchaku
  • Apache-2.0 license

Fixed Parameters:

  • Steps: 4 (always)
  • Guidance: 3.5 (fixed)