Nano Banana vs Seedream: Which to Use for Marketing Images

Synthesys's Nano Banana and Seedream comparison looks at marketing images, including resolution, editing, text and API costs. It's based on documentation and other people's tests; Synthesys hasn't run its own test and discloses that its Studio runs both model families.

Among the useful distinctions: both Nano Banana models and Seedream 4.5 reach 4K, while Seedream 5.0 Pro tops out at 2K. Seedream 5.0 Pro supports edits marked with boxes, arrows or doodles; Seedream 4.5 doesn't.

Nano Banana 2 is free to try in Gemini within usage limits, but neither Nano Banana model has a free Gemini API tier. BytePlus's own model services aren't available in the United States. The comparison also flags the original Nano Banana's API shutdown, scheduled for 2 October 2026.