What Is FLUX.1 Dev?
FLUX.1 Dev is the controllable development checkpoint in the original FLUX.1 family. It exposes inference steps and guidance for reproducible prompt studies and custom art direction, while acceleration stays on the standard tier so cost is predictable.
FLUX Model Versions
FLUX.1 Dev
Tunable · 2K
From 2 Credits
FLUX.2 Klein
Fastest · 1K
From 1 Credits
FLUX.2 Max
The highest-fidelity FLUX.2 tier for final-publish generation and demanding prompt adherence.
- Resolutions: 1K / 2K
- Reference images: not supported
- Modes: Text to Image, Typography
- Speed: Balanced
FLUX.2 Flex
FLUX.2 with explicit guidance and step controls for typography-heavy final renders.
- Resolutions: 1K / 2K
- Reference images: not supported
- Modes: Text to Image
- Speed: Balanced
FLUX.2 Flash
A low-cost FLUX.2 route for rapid generation and exact multi-reference edits.
- Resolutions: 1K / 2K
- Reference images: up to 4
- Modes: Text to Image, Edit Image, Multi-reference
- Speed: Fastest
FLUX.2 Turbo
A fast FLUX.2 draft model with prompt expansion and unusually low megapixel cost.
- Resolutions: 1K / 2K
- Reference images: up to 4
- Modes: Text to Image, Image to Image, Edit Image, Multi-reference
- Speed: Fastest
FLUX.1 Kontext Max
The premium Kontext tier for typography, prompt adherence and identity-preserving edits.
- Resolutions: 1K
- Reference images: up to 1
- Modes: Text to Image, Image to Image, Edit Image
- Speed: Balanced
FLUX.1 Kontext Pro
Fast, context-aware generation and iterative editing from a single reference.
- Resolutions: 1K
- Reference images: up to 1
- Modes: Text to Image, Image to Image, Edit Image
- Speed: Fast
FLUX1.1 Pro Ultra
The high-resolution FLUX1.1 Pro tier for natural photography, detailed materials and reference-guided renders.
- Resolutions: 2K
- Reference images: up to 1
- Modes: Text to Image, Image to Image
- Speed: Balanced
FLUX1.1 Pro
The production FLUX1.1 endpoint for detailed photographic and material-rich final renders.
- Resolutions: 1K / 2K
- Reference images: not supported
- Modes: Text to Image
- Speed: Balanced
FLUX.1 Dev
The tunable FLUX.1 development checkpoint for prompt experiments, seeded studies and controllable rendering.
- Resolutions: 1K / 2K
- Reference images: not supported
- Modes: Text to Image
- Speed: Slow
FLUX.1 Schnell
The original open FLUX speed tier for rapid four-step concepts and inexpensive prompt batches.
- Resolutions: 1K
- Reference images: not supported
- Modes: Text to Image, Typography
- Speed: Fastest
FLUX.2
Realistic light and material detail, with every parameter exposed.
- Resolutions: 1K / 2K / 4K
- Reference images: up to 4
- Modes: Text to Image, Image to Image, Edit Image
- Speed: Balanced
FLUX.2 Klein
The distilled FLUX.2: speed first, same visual language.
- Resolutions: 1K
- Reference images: up to 1
- Modes: Text to Image, Image to Image
- Speed: Fastest
What Is FLUX.1 Dev Best For?
- Seeded prompt studies
- Custom guidance experiments
- Illustration and concept art
- Open-model workflows
How to Use FLUX.1 Dev
- Describe subject, material, light and camera treatment.
- Start at 1K.
- Fix the seed before comparing parameters.
- Render only the selected direction at 2K.
FLUX.1 Dev Settings Explained
Guidance
Start at 3.5 and raise it only when important prompt constraints are missed.
Steps
Twenty-eight is the documented default; fewer steps trade detail for speed.
The panel above shows only the parameters FLUX.1 Dev actually supports. Switch versions and unsupported controls disappear rather than sitting there doing nothing.
FLUX.1 Dev Prompt Examples
Material study
Brushed titanium headphones on dark volcanic stone, precise specular highlights, single strip light, premium product photograph
Cinematic scene
Rainy tram stop at midnight, wet asphalt reflections, one warm practical light, restrained teal film grade, 35mm lens
FLUX.1 Dev Test Results
Testing in progress
Every model runs the same eight-category prompt set — portrait, product, poster text, anime character, interior, multi-reference, image editing and character consistency — recording generation time, success rate, text accuracy and identity retention. That run has not finished for FLUX.1 Dev, so this page shows no scores. We do not publish numbers we have not measured.
FLUX.1 Dev Limitations
- Slower than distilled FLUX routes
- Text-to-image only
- Too much guidance can make output synthetic
FLUX.1 Dev Pricing and Credits
Credits scale with resolution and image count. The Generate button always shows what this run costs.
1K
2 credits / image
2K
6 credits / image
Failed generations cost 0 credits.
Commercial Use and Image Rights
Commercial use is subject to Black Forest Labs' model licence and the selected service terms.
- Model used: FLUX.1 Dev
- Model developer: Black Forest Labs
- The inference route is managed internally and may change without changing the selected model
- Uploads are sent only to the configured inference service needed to complete the generation
- You can delete any generation from your history at any time
Frequently Asked Questions
How is FLUX.1 Dev different from FLUX1.1 Pro Ultra?+
Dev exposes steps and guidance for experimentation; Pro is the managed production-quality endpoint.
Can it edit an uploaded image?+
This page exposes only the exact verified text-to-image operation.
Model Updates and Changelog
- 2026-08-25 —— Added the exact FLUX.1 Dev generation route with resolution-aware pricing.
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