The Flux family (including Flux.1 Dev and Flux 1.1 Pro Ultra) represents a new wave of open-source AI image generators that scale from research and experimentation to professional use. Flux’s architecture rivals big proprietary models in quality and speed, and developers can fine-tune or host their own instances, giving full control over privacy, cost, and workflow. Many Flux variants are entirely free to run (on your own hardware), while cloud providers often add API access with pay-as-you-go pricing — making it flexible for startups, labs, or creative studios

Free/Open-source