image-generate-pro is for the point where an image brief moves past a quick draft. It returns a hosted PNG along with the selected tier, resolved model, dimensions, prompt, seed, and timing.

Save those fields with an approved asset. The next run can reuse the same tier, canvas, and seed, then change only the prompt detail that is under review. That keeps a product image or campaign series on a known baseline.

Start with balanced for the Flux 2 Pro default. If a job needs recraft, seedream, grok, or qwen, treat that tier as a new baseline and keep it fixed for comparable reruns.