Black Forest Labs / blackforestlabs.ai
Open source family of state-of-the-art text-to-image models from former Stable Diffusion researchers, widely adopted as the new foundation model for the AI image generation community.
Free plan
Yes
API access
Yes
Open source
Yes
Platforms
2
FLUX.1 is the image generation model family from Black Forest Labs, founded in 2024 by Robin Rombach and colleagues who were core researchers behind Stable Diffusion. The release of FLUX.1 represented a significant leap in open source image generation quality, and it has been widely adopted by the image generation community as the successor to Stable Diffusion models.
The model achieves state-of-the-art image quality in the open source category, with particularly strong performance on text rendering within images, prompt adherence, and photorealism. In evaluations comparing FLUX.1 Pro to Midjourney, DALL-E 3, and Stable Diffusion 3, FLUX.1 has received strong marks for overall quality and versatility.
The model family has three variants: FLUX.1 [schnell] (fast, Apache 2.0 licensed for commercial use), FLUX.1 [dev] (high quality, non-commercial licence), and FLUX.1 [pro] (highest quality, API-only commercial access). This tiered structure allows community users, researchers, and commercial operators to choose the appropriate version.
FLUX.1 is self-hostable on consumer hardware (16GB+ VRAM recommended for full quality) and is supported in community tools including ComfyUI, InvokeAI, and Automatic1111, giving users access to the same ControlNet, LoRA, and workflow tooling available for Stable Diffusion.
For the image generation community, FLUX.1 has become the default foundation model for new fine-tuning and workflow development, replacing the SDXL and SD 1.5 models that previously dominated. Platforms like Replicate, Civitai, and fal.ai provide API access to FLUX models without local hardware.
FLUX.1 runs as image generation model software built around text and image workflows. Users typically start with a prompt, upload, or connected data source, and the underlying model handles the heavy lifting before returning a result you can refine or export. It's available on self-hosted and api via replicate, fal.ai, etc., with API access for teams that want to embed it into their own products.
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The capabilities that matter most for teams evaluating FLUX.1.
Produces best-in-class open source image quality with particular improvements in text rendering and photorealism over previous models.
Free commercial use for the fast schnell variant, allowing production deployment without licensing fees.
Compatible with LoRA fine-tuning for style-specific model customisation, supported in ComfyUI and other community tools.
FLUX.1 [schnell] model weights are Apache 2.0 licensed and free. FLUX.1 [dev] is available for non-commercial use. FLUX.1 [pro] is API-only via Replicate, fal.ai, and other providers from $0.003/image. Managed API pricing varies by provider.
Model
Open Source
Starting price
Free
Free trial
No
Stable Diffusion 3 is Stability AI's competing foundation model. Midjourney and DALL-E 3 are proprietary alternatives with higher quality ceilings in some categories but no self-hosting. ComfyUI is the recommended UI for FLUX workflows.
A side-by-side look at the closest alternative in this category.
FLUX.1
Black Forest Labs
Stable Diffusion
Stability AI
Key facts about model providers, platforms, and team support.
Model Provider
Black Forest Labs
Models
FLUX.1 [pro], FLUX.1 [dev], FLUX.1 [schnell]
Platforms
Self-hosted, API via Replicate, fal.ai, etc.
Deployment
Open Source, API (via partners)
Integrations
ComfyUI, InvokeAI, Replicate, fal.ai, Civitai, Hugging Face
Team Collaboration
No
Launch Year
2024
Compliance signals and data-handling notes as reported by the vendor.
FLUX.1 [schnell] is Apache 2.0 licensed for commercial use. FLUX.1 [dev] is non-commercial. Commercial use of [pro] via API is governed by provider terms. Review each model variant's licence.
Editorial Verdict
FLUX.1 is the best open source image generation model family currently available and the recommended choice for new self-hosted image generation projects replacing Stable Diffusion models.
Last verified July 24, 2026.
FLUX.1 [schnell] model weights are Apache 2.0 licensed and free. FLUX.1 [dev] is available for non-commercial use. FLUX.1 [pro] is API-only via Replicate, fal.ai, and other providers from $0.003/image. Managed API pricing varies by provider.
Open source model weights free to download and self-host. Stability AI API from $0.003/image for Stable Diffusion 3. DreamStudio credits-based at $10/1,000 credits.
FLUX.1 [schnell] is Apache 2.0 licensed for commercial use. FLUX.1 [dev] is non-commercial. Commercial use of [pro] via API is governed by provider terms. Review each model variant's licence.
Self-hosted: complete data privacy, no third-party data handling. DreamStudio (cloud): review Stability AI's privacy policy.
Review model-specific licence terms. Self-hosted processing keeps data on local hardware. API providers have their own data handling policies.
Self-hosted deployment provides complete privacy with no data leaving your hardware. DreamStudio cloud version requires review of Stability AI's data handling policy.
Review model-specific licence terms. Self-hosted processing keeps data on local hardware. API providers have their own data handling policies.
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