Zhenzhen Doubao Seedream4.0

This is the flagship image node in the Comfly pack's Doubao lineup: Seedream 4.0, with up to 4K resolution, up to five reference images, and a batch mode that can hand you fifteen images from one call. Like everything in this pack it's a paid API client - the model runs on ByteDance's hardware, you pay per image, and nothing touches your GPU. If you want Seedream's aesthetic at high resolution with character/style references and you're okay with a metered bill, this is the node.

Inputs that matter

• prompt - required, multiline.
• model - string, default doubao-seedream-4-0-250828.
• resolution - 1K (default), 2K, or 4K. Higher resolution means a bigger bill and longer waits - 1K to iterate, 4K for finals.
• aspect_ratio - 1:1, 4:3, 3:4, 16:9, 9:16, 2:3, 3:2, 21:9, 9:21, or Custom. Choose Custom and the width/height fields (64–8192) take over.
• image1 … image5 - reference images. Wire one and the prompt becomes a reimagination/reference job; several lets you blend.
• max_images - 1–15 images per run. The README is blunt: the API bills per image, so more images = more money. Keep it at 1 until you know what you want.
• sequential_image_generation - disabled (default) or auto; auto paces the batch so the model isn't stampeded.
• stream - off by default; on, it streams partial output. Nice for long 4K batches, but it can complicate a plain graph.
• seed - -1 for random.
• watermark - default on. Flip it off for clean output.

Outputs: image (IMAGE), image_url, and response.

Install

The usual:

cd ComfyUI/custom_nodes
git clone https://github.com/ainewsto/Comfyui_Comfly

Or ComfyUI Manager → "Comfyui_Comfly" → restart. No models download; credits + key at https://ai.comfly.chat (Comflyapi.json or the node's apikey).

Gotchas

The watermark default-on strikes again - check it before queueing a 4K batch, because re-running fifteen 4K images because of a watermark is an expensive mistake. max_images is where people accidentally spend real money; it defaults to 1, keep it there while tuning. Custom sizing via aspect_ratio: Custom + width/height is a README-documented late addition, so older example workflows won't have it - set it yourself when you need exact canvases. And this node is image generation with references, not an instruction editor - for "change X to Y" jobs, use the SeedEdit nodes instead.