FLUX 3 Image launches with layout controls and 4K output
Black Forest Labs opens a dedicated FLUX 3 image endpoint with layout controls, reference editing and output up to 4K. Pricing and preservation limits matter.
Black Forest Labs released FLUX 3 Image on October 1, 2026, bringing image generation, local editing and reference blending to one API endpoint. The dated release notes establish a separate image rollout after the broader FLUX 3 family announcement in July and its video preview in August.
The practical change is more explicit control over a composition. A developer can describe a scene, supply reference images and specify where individual elements should appear within the same request.
Layout instructions become part of the prompt
BFL’s bounding box guide uses a coordinate grid from zero to 1000. Boxes and element descriptions are appended to the prompt as a JSON list, rather than passed through a separate layout parameter. Source and destination boxes can describe where an object should remain or move.
The image overview allows up to ten references, each between 256 by 256 pixels and 16 megapixels. Users can identify which reference supplies an object, scene or style. Generation and editing share the endpoint, with the prompt determining the task.
Precision still has limits. BFL’s editing documentation says surrounding pixels usually remain unchanged, but shadows, reflections and nearby lighting can shift. It also warns that elements placed in very small boxes may fail to appear. Those qualifications matter when editing approved product imagery or layouts.
Resolution changes the price
The official base rate card lists US$0.041 per image at the smallest preview tier, US$0.048 at 1K, US$0.100 at 2K and US$0.607 at 4K. These are charges per image. Higher resolution therefore carries a meaningful cost increase for repeated revisions.
The API reference defines resolution classes by pixel area, so dimensions vary with aspect ratio. The 4K label does not promise a fixed width and height for every image.
Integration details worth checking
Web and image search grounding is enabled by default and can be switched off. The API may use those searches before generation. Its version field currently accepts only the latest release, with dated versions described as something to add later.
Requests return a polling address. Developers wait for completion and must download the resulting image within an hour, according to the overview. Applications need to preserve finished assets rather than rely on that temporary delivery link.
This is a review of BFL’s published interface and documentation. No generation tests were run for this report. The launch provides concrete controls for image workflows, while editing reliability and consistency still need testing on the images a team actually uses.
