FLUX 1.1 [pro] Ultra API, Deployment, Pricing

black-forest-labs/FLUX-1.1-pro-Ultra

FLUX1.1 Pro Ultra is the high-resolution version of FLUX1.1 Pro, capable of generating images up to 4 megapixels (2K resolution). It improves photo realism and prompt controllability for advanced use cases. The Ultra mode is optimized for composition and precision, while Raw mode prioritizes natural textures and realismâ€”ideal for commercial visual production, art direction, and realistic concept rendering.

API Usage

cURL

Python

JavaScript

curl --request POST \
  --url https://api.siliconflow.com/v1/images/generations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "model": "black-forest-labs/FLUX-1.1-pro-Ultra",
  "prompt": "an island near sea, with seagulls, moon shining over the sea, light house, boats int he background, fish flying over the sea"
}'

Details

Model Provider

black-forest-labs

Type

image

Sub Type

text-to-image

Publish Time

Jul 11, 2025

Price

0.06

/ Image

FLUX.1-schnell

FLUX.1 [schnell] is a 12 billion parameter rectified flow transformer capable of generating images from text descriptions. Trained using latent adversarial diffusion distillation, it can generate high-quality images in only 1 to 4 steps. The model offers cutting-edge output quality and competitive prompt following, matching the performance of closed source alternatives. Released under the Apache 2.0 license, it can be used for personal, scientific, and commercial purposes

12B

text-to-image

FLUX.1 Kontext [pro]

FLUX.1 Kontext Pro is an advanced image generation and editing model that supports both natural language prompts and reference images. It delivers high semantic understanding, precise local control, and consistent outputs, making it ideal for brand design, product visualization, and narrative illustration. It enables fine-grained edits and context-aware transformations with high fidelity.

12B

text-to-image

FLUX.1 Kontext [max]

FLUX.1 Kontext Max is the most powerful and feature-rich model in the Kontext series, designed for high-resolution, high-precision visual editing and generation. It offers superior prompt adherence, detailed rendering, and advanced typographic control. Ideal for enterprise design systems, marketing visuals, and automated creative pipelines that require robust scene transformations and layout control.

12B

image-to-image

FLUX.1-Kontext-dev

FLUX.1 Kontext [dev] is a 12 billion parameter image editing model developed by Black Forest Labs. Based on advanced Flow Matching technology, it functions as a diffusion transformer capable of precise image editing based on text instructions. The model's core feature is its powerful contextual understanding, allowing it to process both text and image inputs simultaneously and maintain a high degree of consistency for characters, styles, and objects over multiple successive edits with minimal visual drift. As an open-weight model, FLUX.1 Kontext [dev] aims to drive new scientific research and empower developers and artists with innovative workflows. Users can leverage it for various tasks, including style transfer, object modification, background swapping, and even text editing

12B

Model FAQs: Usage, Deployment

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What is the FLUX-1.1-pro-Ultra model, and what are its core capabilities and technical specifications?

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