black-forest-labs/flux-3-image-klein-pup
image-text-to-text model by black-forest-labs
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From the publisher
Model card & documentation
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FLUX 3 Image Klein Prompt Upsampler is a 9B vision-language model that expands a short image request into the detailed prompt FLUX 3 Image Klein works best with. It takes the request, up to 10 reference images and an optional list of bounding boxes, and returns one prompt. It is a fine-tune of Qwen3.5-9B. FLUX 3 Image Klein is not meant to run without a prompt upsampler in front of it, for text-to-image, editing and layout alike; a short prompt sent to the image model as typed gives generic output. This one is tuned for it, see Training. Any other LLM can do the job with the system prompts in systemprompts.json. The inference code in black-forest-labs/flux-3-image-klein loads it by default. With Diffusers, run the Transformers block below and pass the caption to the pipeline as prompt. In ComfyUI, the text-to-image templates on flux-3-image-klein-comfy have an enablepromptupsampler switch. Request Prompt 220…
Read the full model card ↗ · Preview checked 2026-10-28T03:52:51.271Z
Inside the original model card — Document outline
- FLUX 3 Image Klein Prompt Upsampler
- Key Features
- Training
- Files
- Usage
- With the FLUX 3 inference code
- With Transformers
- Limitations
- License
- Trademarks & IP
- Citation
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Model overview
black-forest-labs/flux-3-image-klein-pup is a image-text-to-text model repository published by black-forest-labs on Hugging Face. The source reports the transformers library.
This page summarizes Hub metadata. For intended use, training data, evaluation results and limitations, consult the original model card.
Model facts
- Task
- image-text-to-text
- Library
- transformers
- Recent downloads (30 days)
- 38,101
- Cumulative likes
- 60
- Hugging Face trending score
- 59
- Reported safetensors parameters
- 9,409,813,744
- Architecture
- Qwen3_5ForConditionalGeneration
- License
- apache-2.0
- Access
- Not gated by Hugging Face
- Created
- 2026-10-14T20:40:29.000Z
- Last modified
- 2026-10-15T22:59:29.000Z
Compatibility and lineage
Reported languages: en
Reported base models: Qwen/Qwen3.5-9B
Parameter count is not a RAM/VRAM requirement. Check precision, quantization, context length and runtime compatibility in the model card; no hardware or API-cost claim is inferred here.
Use and evaluate
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Source and freshness
Source: Hugging Face Hub. Metadata observed 2026-10-22T06:44:02.555Z. Daily imports are snapshots, not real-time monitoring.
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