Black Forest Labs adds custom output sizes to FLUX 3 Image
The FLUX 3 Image API now accepts custom width and height up to 16.8MP, or `resolution: "match_input"` for edits up to 4MP. Single-reference-image edits also follow instructions more closely; pricing is unchanged.
Source: BFL API release notes, checked Oct 28, 2026. Summarized from the provider’s announcement.