What Seedream 4 is good at — and what it's not

Seedream 4 is ByteDance's all-in-one image model — the earlier release in the Seedream line that folds generation and editing into a single tool. There's no separate edit API: start from a text prompt, then mark a region, swap an object, and the edit lands in the same model without the subject drift that comes from crossing tool boundaries. For workflows that loop between "generate" and "fix this part," that single-model continuity is the core appeal.

Output runs up to 4K (2K is the default, with 3K and 4K available), and up to 10 reference images hold a character, wardrobe, or style across a run — the building block for storyboards, comic panels, and product series where the same subject has to recur. Strong spatial reasoning makes it a fit for previz frames and stylized key art across eight aspect ratios.

Where it sits in the line: Seedream 4.5 improves edit consistency and adds a six-image batch; Seedream 5.0 Lite is the newest value tier at native 3K and the lowest cost. For multilingual text and factual grounding, Nano Banana 2 is the better tool; for photoreal portraits, Flux 2 Pro.

A reasonable mental model: default to Seedream 4 for all-in-one generate-and-edit work up to 4K, and step to 4.5 for the deepest batch and best edit consistency, or 5.0 Lite for cheap native-3K iteration.