FLUX.1 SRPO [dev]

FLUX.1 SRPO [dev] uses a preference-optimized FLUX.1 variant designed to favor visually compelling, prompt-aligned image results. This generation route creates the scene directly from written art direction.

Use it when aesthetic selection and clear prompt interpretation matter more than neutral base-model behavior. Describe the central subject, visual hierarchy, lighting, color, material, and atmosphere in complete sentences. SRPO’s role is to improve the model’s preference toward satisfying results, while the brief remains responsible for the exact creative target.

Highlights

• Preference-optimized generation. Favors image candidates aligned with learned aesthetic and prompt-satisfaction preferences.
• Strong visual hierarchy. Produces balanced composition, readable subject emphasis, and coherent scene structure.
• Prompt-aligned aesthetics. Connects requested style, mood, lighting, and material treatment to the final image.
• Detailed scene synthesis. Renders subjects and environments with polished texture, illumination, and spatial relationships.

Pricing

When to Use

Prompt Guide

Write a complete visual brief: identify the subject and references, define composition and viewpoint, describe lighting, palette, materials, typography, and finish, then list exact preservation constraints. FLUX.2 Klein does not rely on prompt upsampling, so use clear descriptive sentences rather than sparse keywords.

{
  "prompt": "A photorealistic editorial composition with precise subject placement, controlled lighting, exact colors, and clean typography",
  "seed": 1,
  "aspect_ratio": "21:9",
  "output_format": "jpeg"
}

Technical Specs

Related Models

• bfl/flux-1/krea/redux
• bfl/flux-1/lora
• bfl/flux-1/pulid