Flux.1
Open Weights
Black Forest Labs
Black Forest Labs' 12B parameter rectified flow transformer for text-to-image generation. Created by ex-Stability AI developers, released August 2024. Three variants: schnell (Apache 2.0, 1-4 steps, fast), dev (guidance distillation, efficient), pro (state-of-the-art quality). Uses Diffusion Transformer combining Transformer and CNN architectures. Supports resolutions: 1024x1024, 768x1344, 1344x768, 1216x832. Schnell variant generates high-quality images in only 1-4 steps using latent adversarial diffusion distillation. Enables commercial use (schnell/pro), dev for non-commercial.
Strengths
- Schnell variant generates quality images in just 1-4 steps (extremely fast)
- Apache 2.0 license for schnell enables unrestricted commercial use
- 12B parameter Diffusion Transformer architecture for quality output
- Multiple resolution support: square, portrait, widescreen formats
- Created by ex-Stability AI team (proven image generation expertise)
- Three variants optimize for speed (schnell), efficiency (dev), or quality (pro)
- Flexible licensing across variants for different use cases
Caveats
- Dev variant restricted to non-commercial use
- 12B size requires GPU resources for self-hosting
- Relatively new (Aug 2024) - ecosystem still developing
- Limited resolution options compared to some competitors
- Pro variant pricing not transparently published
- Vendor
- Black Forest Labs
- License
- Apache 2.0 (schnell), Proprietary (dev/pro)
- Release Date
- 2024-08-01
- Modalities
- textimage
Capabilities
Vision
Audio
Video
Tool Use
Resources
Pricing
Schnell: Free (Apache 2.0). Dev: Non-commercial only. Pro: API pricing varies