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Guidance Tuning

Control prompt adherence with classifier-free guidance (CFG).

Understanding Guidance

Low guidance (1.0-2.0): Loose interpretation, more creative
Medium guidance (2.5-4.0): Balanced
High guidance (4.5-10.0): Strict adherence, can over-saturate

FLUX Family

FLUX Dev2

Range: 1.0 - 5.0
Sweet spots:

  • Short prompts: 3.5 - strong adherence
  • Medium prompts: 2.5 - balanced
  • Detailed prompts: 1.5 - let model breathe
  • Very detailed: 1.0 - maximum freedom
Terminal window
# Detailed prompt with low guidance
curl -X POST "..." \
  -d '{
    "prompt": "portrait, 35mm, natural light, golden hour, ...",
    "guidance": 1.5
  }'

FLUX Dev

Range: 2.0 - 5.0
Default: 3.5
Recommendation: Stay at 3.5 for consistency

FLUX Schnell

Fixed: 3.5
Cannot be changed (distilled for this value).

Z-Image

Fixed: 1.0 (internally)
The guidance parameter is ignored. Z-Image uses fixed CFG.

WAN Video

Range: 6.0 - 8.0
Default: 7.0
Recommendation:

  • Subtle motion: 6.0
  • Normal: 7.0
  • Strong motion: 8.0