Flux SRPO Photorealistic Rendering
FLUX.1 SRPO is a 12B flow transformer tuned with Semantic Relative Preference Optimization for highly realistic, visually appealing image generation and edits.
- Black Forest Labs
- 2 variants
- From $0.025 per megapixel
- Price
- See price
- Speed
- See speed
- Best for
- Image edit · Image to Image
- Price
- See price
- Speed
- ~6s
- Best for
- Text to Image
More from Black Forest Labs.
A family groups the versions of one model line. Open one to compare its variants side by side.
Working with Flux SRPO.
FLUX.1 SRPO [dev] is a 12-billion-parameter flow transformer fine-tuned with Semantic Relative Preference Optimization — a preference-tuning method aimed squarely at realism and visual appeal. The family pairs a text-to-image variant with an image-to-image variant that applies prompt-guided edits to reference photos.
When to choose Flux SRPO
Choose SRPO when photorealism is the target and you want a preference-tuned Flux rather than a general one. Flux Dev's Realism variant is the closest alternative; Flux Krea targets aesthetic quality rather than strict realism.
Choosing between the variants
Text to Image generates from a prompt at the family's realism bias. Image to Image takes a reference photo and applies refined, prompt-guided edits while holding its aesthetic character.
Questions about Flux SRPO
The short answers. For anything specific to your setup, talk to our team.
Talk to an engineerPlan for your expected volume.The fine-tuning method behind SRPO. It optimises the model against relative preference between outputs, which is what pushes it toward realistic and visually appealing results.
12 billion parameters, on the same flow-transformer architecture as the rest of the FLUX.1 line.
Yes. The image-to-image variant transforms reference photos with prompt-guided edits rather than only generating from scratch.