Black Forest Labs, a German AI startup founded by former Stability AI engineers, launched FLUX.2 klein, a new pair of open-source AI image generators capable of generating images in under a second, according to a VentureBeat report. The models prioritize speed and lower compute requirements.
Released yesterday, the klein series includes two primary parameter counts: 4 billion (4B) and 9 billion (9B). The 4B parameter version is available under the Apache 2.0 license, enabling commercial use. The model weights are available on Hugging Face and code on Github.
The release of FLUX.2 klein continues Black Forest Labs' development of open-source AI image generators. The company previously released the larger models in the FLUX.2 family (max and pro) in November 2025. These models focused on photorealism and "grounding search" capabilities, according to VentureBeat.
The new klein models are already being integrated into platforms like Fal.ai, demonstrating the trend towards democratizing AI technology and lowering barriers to entry, VentureBeat reported. The models achieve their speed using an Nvidia GB200.
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