Flux is a family of image generation models from Black Forest Labs — founded by former Stability AI researchers — that quickly became benchmarks for quality and prompt adherence when released. The models are available in different sizes balancing speed and quality, and the open-weight versions can be run locally or via API through platforms like Replicate and fal.ai. Flux’s exceptional photorealism and strong text rendering have made it the model of choice in many professional and developer workflows.