The image model just grew a bounding-box api. black forest labs shipped flux 3 on oct 1, generating…
the image model just grew a bounding-box api. black forest labs shipped flux 3 on oct 1, generating or editing from up to 10 reference images at 4k, with json boxes to place elements.
the canvas now takes coordinates.
Context
Black Forest Labs released FLUX 3 Image on Oct 1, 2026 through its API and Playground, per CiVL News and Tech Times. It accepts JSON arrays of bounding boxes on a 0 to 1000 grid appended to the prompt, and generates up to 5,456 by 3,072 pixels, about 16.8 megapixels.
Cocoloop reports generation and editing sit behind a single endpoint and allow up to 10 reference images.
The Oct 1 date, JSON bounding boxes, 4K output and up to 10 reference images match the sources. Tech Times adds that pixels outside a selected region are preserved numerically. The 'canvas takes coordinates' line is the author's.
'the canvas now takes coordinates' is the author's opinion.
Related work
- CiVL News: Black Forest Labs releases its image model with layout controls ↗Release summary.
- Tech Times: Black Forest Labs launches Flux 3 Image ↗Layout and editing detail.
- Cocoloop: BFL opens FLUX 3 image API ↗API and reference images.
Watch next
- Check Black Forest Labs' own docs for the bounding-box format.
Sources
- CiVL News, Oct 2026civl.com
- Tech Times, Oct 2, 2026techtimes.com
- Cocoloop, Oct 2, 2026news.cocoloop.cn
Provenance
The note above is reproduced unedited from the original post, first published on Threads on 11 October 2026 at 01:48 IST. Sources are the papers and datasets the note draws on.
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