Documentation Index
Fetch the complete documentation index at: https://docs.bfl.ml/llms.txt
Use this file to discover all available pages before exploring further.
FLUX.2 spans the full spectrum of image generation—from sub-second inference with [klein] to highest quality with [max]. Generate photorealistic images with precise control over colors, poses, and composition, or edit existing images by referencing up to 10 sources simultaneously.
Choose [klein] for real-time, high-volume generation, [pro] for production at scale, [flex] for fine-grained control, or [max] for maximum quality and grounding search.
What Can You Do?
- Multi-Reference
- Photorealism & Detail
- Grounding Search
- Typography & Text
- Exact Color Control
- Structured Prompting
Combine elements from multiple images while maintaining identity across complex scenes. Create ad variants with consistent faces, product mockups in any context, or fashion editorials where models stay consistent.
Which Model to Choose?
| [klein] | [max] | [pro] | [flex] | [dev] | |
|---|---|---|---|---|---|
| Best for | Real-time, high-volume | Highest quality, final assets | Production at scale | Quality with control | Local development |
| Multi-reference | Up to 4 | Up to 8 (API), 10 (playground) | Up to 8 (API), 10 (playground) | Up to 8 (API), 10 (playground) | Recommended max 6 |
| Controls | Standard | Standard | Standard | Adjustable steps & guidance | Full customization |
| Grounding search | No | Yes | No | No | No |
| Pricing | from $0.014 / image | from $0.07 / MP | from $0.03 / MP | $0.06 / MP | Free (non-commercial) |
FLUX.2 [klein] delivers sub-second inference with open weights. 4B runs on consumer GPUs (~13GB VRAM). Apache 2.0 for 4B, FLUX NCL for 9B. See model details below.
FLUX.2 [max] includes grounding search: when prompted, it performs web searches to access real-time information to visualize trending products, current events, or the latest styles without manually sourcing reference material.
Compare FLUX.2 Models
At a Glance
[klein]
Sub-second inference. Our fastest models with open weights. Runs on consumer GPUs (~13GB VRAM). From $0.014/image via API, or run locally with Apache 2.0 (4B) / FLUX NCL (9B).
[max]
Maximum performance. Highest editing consistency across tasks. Vast world knowledge. Strongest prompt following and faithful style representation.
[pro]
Top performance at affordable price. The high quality, production-grade image editing and generation model.
[flex]
Specialized for typography. Best for text rendering and preserving small details.
FLUX.2 [klein] Models
![FLUX.2 [klein] diverse output examples](https://cdn.sanity.io/images/2gpum2i6/production/900de0722995119df9f27d799bdfed194d2112ac-2127x1400.jpg)
Open weights available: [klein] 4B is fully open under Apache 2.0. [klein] 9B is available under the FLUX Non-Commercial License. Download from Hugging Face.
API Models
| [klein] 4B | [klein] 9B | |
|---|---|---|
| Best for | High volume, local deployment | Balanced quality and speed |
| Inference steps | 4 (step-distilled) | 4 (step-distilled) |
| Speed | Sub-second | Sub-second |
| API Pricing | 0.001/MP | 0.002/MP |
| License | Apache 2.0 | FLUX Non-Commercial License |
Open Weights (Community)
The Base variants are undistilled foundation models with full training signal—ideal for fine-tuning, LoRA training, research, and custom pipelines. Higher output diversity than distilled models.| [klein] Base 4B | [klein] Base 9B | |
|---|---|---|
| Best for | Fine-tuning, research, custom pipelines | Maximum quality, research |
| Output diversity | High | Highest |
| Step-distilled | No (full capacity) | No (full capacity) |
| License | Apache 2.0 | FLUX Non-Commercial License |
| Availability | Hugging Face | Hugging Face |
Base models are available as open weights for local development and research. They are not offered on the public API.
FLUX.2 [klein] does not include prompt upsampling. Write detailed, descriptive prompts for best results. See our Prompting Guide for techniques.
Preview Endpoints
Preview endpoints are where our latest improvements land first. They reflect our most recent advances in quality and speed.| Endpoint | Description |
|---|---|
flux-2-pro-preview | Our latest FLUX.2 [pro] model. |
flux-2-pro | A fixed snapshot of FLUX.2 [pro]. This endpoint will not change, making it suitable for workflows that require reproducibility. |
flux-2-klein-9b-preview | Our latest FLUX.2 [klein] 9B model with KV caching for improved performance. |
flux-2-klein-9b | A fixed snapshot of FLUX.2 [klein] 9B. Choose this when you need reproducibility. |
The
flux-2-pro and flux-2-klein-9b endpoints are unchanged. If you are already using them, no action is required.Getting Started
Try in Playground
Test FLUX.2 [max], [pro], and [flex] in your browser. No setup required.
Download [klein] Weights
Get [klein] weights from Hugging Face for local inference.
Text-to-Image API
Generate images from text prompts.
Image Editing API
Edit images with multi-reference support.
Prompting Guide
Master prompting techniques — basics, style, JSON, editing, and use cases.
Local Development
Download [dev] weights for local inference.