Black Forest Labs Flux 3 Image Klein
Black Forest Labs' smaller, faster FLUX 3 image model with open weights: text-to-image, image editing and multi-reference generation, with native 4K output.
Flux 3 Image Klein is a cloud image-generation model from Black Forest Labs. It generates images from a text prompt, and can take reference images to guide style or composition (image-to-image). It outputs up to 4K across 15 aspect ratios. Images can be saved as PNG, JPEG, and WebP. It runs through Runware, OpenRouter, and Black Forest Labs using your own API key, from about $0.009 per image.
- Released
- Oct 2026
- Pricing
- $0.009 per image
- Max resolution
- 4K
- Aspect ratios
- 1:1, 16:9, 9:16 +12 more
- Image-to-image
- Up to 10 reference images
- Output formats
- PNG, JPEG, WebP
Samples
Generated with Flux 3 Image Klein via Runware. The same three prompts run against every model in the catalog, first result kept, so the only thing that changes between two models’ tiles is the model.
Materials, reflections, macro detail
Skin texture, lighting, shallow depth of field
Text rendering, layout, flat colour
Black Forest Labs
Black Forest Labs makes the FLUX family of image models — state-of-the-art open-weight image generation.
blackforestlabs.ai ↗Professional-grade Flux model for photorealistic and artistic image synthesis.
Black Forest Labs' top-tier Flux 2 model — highest fidelity, strongest prompt adherence, and most stable multi-reference editing.
Black Forest Labs' image model on the FLUX 3 backbone: text-to-image, precise local edits, up to ten references, accurate typography, and native 4K output.
Black Forest Labs' multimodal video model: text, image, or video in, with synchronized audio, lip-sync, and a cheap draft mode.
Black Forest Labs' fast video editing model: rewrites a source clip from a text prompt, adding, removing or replacing objects and settings while keeping its length, aspect ratio and audio.
Black Forest Labs' video upscaler: enlarges a source clip by 1.5 to 3 times, either staying faithful to the footage or adding fine detail, with an optional prompt to steer it.