Model · Black Forest Labs · Image-Gen
FLUX 3 Image Klein
Black Forest Labs' small open-weights FLUX 3 image model — one 5.6B model for text-to-image, photo editing and multi-reference generation with up to 10 reference images, built to run on consumer graphics cards. Supersedes FLUX.2 [dev] as the open FLUX model to start with.
- Modality
- Image-Gen
- License
- FLUX Kommunity License (Open weights)
- Parameter size
- 5.6B image generator (text encoder not counted); base and step-distilled checkpoints, plus FP8, INT8 and NVFP4 builds
- Released
- October 15, 2026
- Last verified
- October 28, 2026
- Runs locally
- Yes
What you need to run it
- Mac
- Yes. Any Apple Silicon Mac (M1 or newer) with at least 16 GB (32 GB recommended) of memory. Newer chips are faster, but memory is what decides whether it runs.
- Windows / Linux PC
- NVIDIA works best. A graphics card with at least 8 GB (16 GB recommended) of video memory.
- No graphics card
- Not practical. Too slow without a graphics card or Apple Silicon.
Runs on Apple Silicon through community MLX and GGUF builds, and in ComfyUI, with 16 GB the practical starting point.
Numbers are for: About 5.5B model: compressed 8-bit/FP8 builds for the minimum, full 16-bit for recommended. Based on the maker’s own figures; where the maker gives only a graphics-card figure, the Mac memory is our estimate.
Strengths
- Runs on an 8 GB NVIDIA graphics card with the INT8 build (11.2 GB in BF16, 5.6 GB in FP8)
- One model covers text-to-image, editing and multi-reference generation with up to 10 reference images
- Native 4K output and bounding boxes to control where things go or confine an edit to one area
- Free for commercial use for individuals and smaller companies — unlike FLUX.2 [dev], which is non-commercial
- Day-one support in ComfyUI and Hugging Face Diffusers; a base checkpoint for LoRA fine-tuning
Weaknesses
- Free for commercial use only under $5M annual revenue (FLUX Kommunity License) — larger companies need a self-hosted licence or the paid API
- Weights are gated on Hugging Face: you accept the licence before downloading (approval is automatic)
- Quality rankings are Black Forest Labs' own internal evaluations
Try it
| Where | Type | Notes |
|---|---|---|
| Hugging Face | weights | Step-distilled model; gated, licence accepted on download |
| Hugging Face (base) | weights | Base checkpoint for fine-tuning |
| ComfyUI | local | Day-one support; ComfyUI repack on Hugging Face |
| BFL API | hosted-api | API key required; model ID flux-3-image-klein |
Version history
- FLUX 3 Image Klein Oct 2026 Current
- FLUX.2 [pro] Nov 2025
- FLUX.2 [dev] Nov 2025 Deprecated
- FLUX.1 [dev] Aug 2024 Deprecated
Official sources
- Announcement announcement
- Model card model
- API docs docs
Change log
- — Added hardware requirements (Mac support, memory, NVIDIA). Source: the maker's figures (8 GB with the INT8 build; 11.2 GB in BF16, 5.6 GB in FP8); Mac memory is estimated.
- — Initial entry. Released 2026-10-15 under the FLUX Kommunity License (free commercial use under $5M annual revenue). Added from the popularity sweep: the ComfyUI repack had 751k Hugging Face downloads in the last month and the main repo 123k, and both were in the top three trending image-to-image models on Hugging Face on 2026-10-28.
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