Magic Prompt for FLUX.3

Set magic_prompt to rewrite text-to-image prompts for FLUX.3 while preserving your text, subject counts, and layout.

FLUX.3 now has model-specific prompt rewriting. Set model: "black-forest-labs/flux-3" and magic_prompt: true on POST /image/generate to use it.

The rewrite uses natural language and preserves supplied text, subject counts, and layout. Your original prompt stays in request.prompt, and the rewritten prompt is returned in result.magic_prompt.positive. See enhance prompts.