Log inSign Up
Open Hedra

Flux 1.1 Ultra

All models
Image modelBlack Forest Labs

Overview

Flux 1.1 Ultra is a premium text-to-image model developed by Black Forest Labs, designed to generate high-resolution 4-megapixel visuals in roughly 10 seconds. Building on Flux 1.1 Pro, it delivers sharp, photorealistic results with strict prompt adherence. The model features distinct "Ultra" and "Raw" generation modes, making it highly effective for professional workflows, polished marketing assets, and candid, natural-looking photography.

Best of Flux 1.1 Ultra

A close-up shot of bioluminescent blue flowers glowing with bright cyan speckles in a dark forest. Two glowing butterflies hover among the blossoms. In the background, a warm orange sunset filters through blurred trees. This vertical 1792x2368 resolution image was generated using the Flux 1.1 Ultra model.Bioluminescent Flowers at Sunset — Flux 1.1 UltraA close-up photograph of a melting scoop of vanilla ice cream in a waffle cone, drizzled with glossy chocolate syrup. Generated using Flux 1.1 Ultra at a resolution of 2752x1536, the image features warm, natural sunlight and a soft, blurred background.Melting Ice Cream Cone — Flux 1.1 UltraA vertical digital illustration of a floating island suspended in a sky filled with soft clouds at sunset, generated by Flux 1.1 Ultra at 1536x2752 resolution. Lush green trees sit atop the island, while long roots taper to a point below, with multiple waterfalls cascading down into the valley.Floating Island with Waterfalls — Flux 1.1 UltraA high-resolution 2752x1536 image generated by Flux 1.1 Ultra showing a male and female host smiling in a modern podcast studio. They sit at a reflective table with microphones, surrounded by glowing purple and pink neon lights and floating digital interface graphics.Flux 1.1 Ultra: Modern Podcast Hosts in Neon StudioA wide shot of a woman with short green hair seen from behind, standing on a rooftop ledge. She looks out over a bustling, neon-lit New York City street at night with glowing skyscrapers. This high-resolution 2752x1536 image was generated using the Flux 1.1 Ultra model.Woman Overlooking Neon City Skyline — Flux 1.1 Ultra

What is Flux 1.1 Ultra best used for?

Flux 1.1 Ultra by Black Forest Labs is designed for generating ultra-high-resolution, photorealistic images. It can produce outputs up to 4 megapixels (2048x2048), making it ideal for detailed artwork, large-format prints, and full-width hero images. Community consensus highlights its exceptional prompt adherence, sharp text rendering, and ability to handle complex compositions without losing fine details.

When was Flux 1.1 Ultra released and what is its lineage?

Black Forest Labs announced Flux 1.1 Ultra on November 6, 2024. It serves as a high-resolution upgrade to the standard Flux 1.1 Pro, delivering 4x the resolution while maintaining fast generation speeds. The Flux family lineage later expanded to include the Flux.2 [pro] generation and specialized context-editing models like Flux Kontext Pro.

What is 'Raw Mode' and when should I use it?

Introduced alongside the Ultra update, Raw Mode is a generation setting that produces a more natural, less synthetic aesthetic. It is highly recommended by the community for mimicking authentic, candid photography. Raw mode captures genuine textures and significantly improves realism in nature and human portraits by avoiding the over-stylized 'AI look' common in default outputs.

How should I prompt Flux 1.1 Ultra for the best results?

Because of its 12-billion-parameter architecture, Flux 1.1 Ultra follows complex instructions incredibly well. Use direct, descriptive language and specify exact lighting, camera angles, and textures. If you need text in your image, wrap the exact words in quotes. For more advanced techniques, check out Adobe's Firefly/Flux prompting guide.

Similar models

Dreamina 3.1ByteDanceFlux 1.1 ProBlack Forest LabsImagen 4GoogleFlux Kontext MaxBlack Forest LabsFlux Kontext ProBlack Forest Labs

Prompt tips

  • Optimize for Raw Mode: When aiming for lifelike photography, enable Raw mode and use terms like "candid photography," "amateur photo," or "uncropped" to maximize natural aesthetics.

  • Drop the Quality Tags: Because of its native high-resolution capabilities, you do not need to pad prompts with "4k, 8k, ultra-detailed, masterpiece." Keep descriptions focused on the actual subject and scene.

  • Use Natural Language: The model responds best to conversational, descriptive sentences detailing the subject, lighting, and camera angle, rather than comma-separated keyword lists.

  • Specify Composition Explicitly: The model has high prompt adherence, so detailed instructions regarding camera lenses (e.g., "shot on 35mm lens") and lighting (e.g., "dramatic rim lighting") translate directly to the output.