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Seedream 5.0 Pro
Use seedream-5.0-pro for text-to-image or editing with up to ten public image references. A request accepts a prompt up to 7,000 characters and produces one image (n: 1). Choose 1K or 2K; the launch contract does not enable layer decomposition or arbitrary pixel dimensions. size can be auto, 1:1, 16:9, 9:16, 4:3, 3:4, 3:2, 2:3, 5:4, 4:5 or 21:9. Output is PNG.
For an edit, add image_urls, for example ["https://your-cdn.example/seed.png"], and describe what to preserve and change. Send a stable Idempotency-Key and Prefer: respond-async. Poll the returned Task ID to obtain result.urls. Launch prices are $0.10 for 1K and $0.15 for 2K, including all permitted reference images. Check the live Catalog for the current availability and resolution price; submit separate requests for variants.