# FLUX1.1 [pro] Ultra

> Black Forest Labs' ultra-high resolution image generation model, an enhanced version of FLUX1.1 [pro] optimized for premium quality output

## Quick Reference

- Model ID: flux1.1-pro-ultra
- Creator: Black Forest Labs
- Status: active
- Family: flux1.1
- Base URL: https://api.lumenfall.ai/openai/v1

## Specifications

- Max Resolution: 2048x2048
- Input Modalities: text
- Output Modalities: image

## Model Identifiers

- Primary Slug: flux1.1-pro-ultra
- Aliases: flux-pro-1.1-ultra

## Dates


## Tags

image-generation, text-to-image, photorealistic, high-quality

## Available Providers

### Replicate

- Config Key: replicate/flux1.1-pro-ultra
- Provider Model ID: black-forest-labs/flux-1.1-pro-ultra
- Pricing:
  - source: official
  - currency: USD
  - components: [{"type" => "output", "metric" => "image", "unit_price" => 0.06}]
  - source_url: https://replicate.com/black-forest-labs/flux-1.1-pro-ultra
  - effective_at: 2025-12-30

### fal.ai

- Config Key: fal/flux1.1-pro-ultra
- Provider Model ID: fal-ai/flux-pro/v1.1-ultra
- Pricing:
  - source: official
  - currency: USD
  - components: [{"type" => "output", "metric" => "image", "unit_price" => 0.06}]
  - source_url: https://fal.ai/models/fal-ai/flux-pro/v1.1-ultra
  - effective_at: 2025-12-28


## Image Gallery

3 images available for this model.
- Curated examples: 3
  - "A wide, cinematic low-angle shot of a premium, brushed aluminum camera body resting on a dark walnut desk. Engraved e..."
  - "Cinematic wide shot of a master ceramicist's sun-drenched atelier. In the center, a weathered wooden potter's wheel s..."
  - "A sun-drenched artisanal bakery storefront with a large gold-leaf sign on the window reading "HONEY & RYE". In the ba..."

## Example Prompt

The following prompt was used to generate an example image in our playground:

A sun-drenched artisanal bakery storefront with a large gold-leaf sign on the window reading "HONEY & RYE". In the background, a calm capybara sits patiently on the sidewalk by a bicycle, while a baker carries a tray of fresh sourdough.

## Code Examples

### Text to Image (Generation)

#### cURL

curl -X POST \
  https://api.lumenfall.ai/openai/v1/images/generations \
  -H "Authorization: Bearer $LUMENFALL_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "flux1.1-pro-ultra",
    "prompt": "A serene mountain landscape at sunset",
    "size": "1024x1024"
  }'

# Response:
# { "created": 1234567890, "data": [{ "url": "https://...", "revised_prompt": "..." }] }

#### JavaScript

import OpenAI from 'openai';

const client = new OpenAI({
  apiKey: 'YOUR_API_KEY',
  baseURL: 'https://api.lumenfall.ai/openai/v1'
});

const response = await client.images.generate({
  model: 'flux1.1-pro-ultra',
  prompt: 'A serene mountain landscape at sunset',
  size: '1024x1024'
});

// { created: 1234567890, data: [{ url: "https://...", revised_prompt: "..." }] }
console.log(response.data[0].url);

#### Python

from openai import OpenAI

client = OpenAI(
    api_key="YOUR_API_KEY",
    base_url="https://api.lumenfall.ai/openai/v1"
)

response = client.images.generate(
    model="flux1.1-pro-ultra",
    prompt="A serene mountain landscape at sunset",
    size="1024x1024"
)

# { created: 1234567890, data: [{ url: "https://...", revised_prompt: "..." }] }
print(response.data[0].url)


## About

## Overview
FLUX1.1 [pro] Ultra is a high-resolution text-to-image model developed by Black Forest Labs. As an enhanced evolution of the standard FLUX1.1 [pro] architecture, it is specifically engineered to produce premium, photography-grade outputs at significantly higher pixel counts. The model is distinctive for its ability to maintain compositional coherence and fine-textured detail while operating at extreme resolutions.

## Strengths
*   **Ultra-High Resolution Output:** Unlike base models that often degrade or repeat patterns at high resolutions, this version is optimized for large-scale generations up to 4 megapixels while maintaining structural integrity.
*   **Photorealistic Texture Rendering:** The model excels at reproducing complex surface details, such as skin pores, fabric weaves, and atmospheric effects, making it suitable for professional-grade photography emulation.
*   **Improved Prompt Adherence:** It demonstrates high fidelity to complex, multi-part instructions, accurately placing objects and satisfying specific lighting or stylistic requirements defined in the prompt.
*   **Speed Efficiency:** Despite the increase in output resolution and quality, the model maintains the competitive inference speeds introduced with the FLUX1.1 architecture, offering a faster workflow than many comparable high-resolution diffusion models.

## Limitations
*   **Cost Per Generation:** With a starting price of roughly $0.06 per image, it is significantly more expensive than "dev" or "schnell" variants, making it less ideal for rapid prototyping or high-volume testing.
*   **Hardware and Latency:** Generating images at ultra-high resolutions requires substantial VRAM and compute time; even with optimizations, the time-to-first-pixel is longer than the standard FLUX1.1 [pro] version.
*   **Over-Refinement:** In certain artistic contexts, the model’s bias toward "premium" and sharp textures may result in an overly polished look that requires specific prompting to achieve a more muted or "lo-fi" aesthetic.

## Technical Background
FLUX1.1 [pro] Ultra is built upon the Flow-based transformer architecture characteristic of the Black Forest Labs lineup. It utilizes a rectified flow scaling approach, which streamlines the sampling process to achieve high-quality results in fewer steps than traditional latent diffusion models. The "Ultra" designation refers to specific fine-tuning and scaling adjustments designed to handle expanded canvas sizes without the tiling artifacts common in earlier diffusion generations.

## Best For
This model is best suited for professional workflows where final-asset quality is paramount, such as digital advertising, high-fidelity concept art, and print-ready media. It shines in scenarios requiring hyper-realistic human portraits or intricate architectural visualizations. 

FLUX1.1 [pro] Ultra is available through Lumenfall’s unified API and playground, allowing developers to integrate ultra-high resolution image generation into their applications with a single standardized interface.

## Frequently Asked Questions

### How much does FLUX1.1 [pro] Ultra cost?

FLUX1.1 [pro] Ultra starts at $0.06 per image through Lumenfall. Pricing varies by provider. Lumenfall does not add any markup to provider pricing.

### How do I use FLUX1.1 [pro] Ultra via API?

You can use FLUX1.1 [pro] Ultra through Lumenfall's OpenAI-compatible API. Send requests to the unified endpoint with model ID "flux1.1-pro-ultra". Code examples are available in Python, JavaScript, and cURL.

### Which providers offer FLUX1.1 [pro] Ultra?

FLUX1.1 [pro] Ultra is available through Replicate and fal.ai on Lumenfall. Lumenfall automatically routes requests to the best available provider.

### What is the maximum resolution for FLUX1.1 [pro] Ultra?

FLUX1.1 [pro] Ultra supports images up to 2048x2048 resolution.

## Links

- Model Page: https://lumenfall.ai/models/black-forest-labs/flux1.1-pro-ultra
- About: https://lumenfall.ai/models/black-forest-labs/flux1.1-pro-ultra/about
- Providers, Pricing & Performance: https://lumenfall.ai/models/black-forest-labs/flux1.1-pro-ultra/providers
- API Reference: https://lumenfall.ai/models/black-forest-labs/flux1.1-pro-ultra/api
- Benchmarks: https://lumenfall.ai/models/black-forest-labs/flux1.1-pro-ultra/benchmarks
- Use Cases: https://lumenfall.ai/models/black-forest-labs/flux1.1-pro-ultra/use-cases
- Gallery: https://lumenfall.ai/models/black-forest-labs/flux1.1-pro-ultra/gallery
- Playground: https://lumenfall.ai/playground?model=flux1.1-pro-ultra
- API Documentation: https://docs.lumenfall.ai