Flux

Flux is a state-of-the-art open-source image generation model developed by Black Forest Labs, founded by the original creators of Stable Diffusion. Flux models have consistently topped image generation benchmarks, producing images with exceptional detail, photorealism, and prompt adherence. The model family includes Flux.1 Pro (best quality), Flux.1 Dev (open-weight for developers), and Flux.1 Schnell (fastest, fully open-source).

Key features include superior prompt following that accurately renders complex scenes and compositions, excellent text rendering within images, natural skin textures and lighting in portrait generation, support for various aspect ratios, and an architecture based on flow matching and transformer technology that produces cleaner, more coherent outputs than diffusion-based predecessors. Flux models are available through numerous platforms including Replicate, fal.ai, and ComfyUI.

Flux.1 Schnell is completely free and open-source under Apache 2.0, while Flux.1 Dev is available under a non-commercial license for research. Flux.1 Pro is available via API through Black Forest Labs and partner platforms, with pricing around $0.05 per image. Flux has rapidly become the preferred model for developers and power users seeking the highest quality open-source image generation, rivaling and often surpassing closed-source competitors.