Jimeng Seedream 3

Seedream 3 is the pack's plainest image node: type a prompt, get an image. No reference inputs, no group generation, no web search - it's the 2025 workhorse of ByteDance's image line, and the pack ships it because plenty of people still have workflows built on it. You'd reach for it if you already have a prompt pipeline tuned for Seedream 3 and just want it to keep running.

The important thing to know is the caveat from the README: the underlying model, doubao-seedream-3-0, is in the official retirement pipeline. The platform is winding down its quota, and eventually the service goes away. The pack marks the node deprecated and points you to Seedream 5 as the replacement. Nothing about the node is broken today; it's just running on borrowed time. If you're starting fresh, skip it.

As with everything in this pack, there's no local model - you need a paid Volcano Ark API key and the image is generated on ByteDance's servers.

How it works

Straightforward request/response: your prompt goes to the fixed doubao-seedream-3-0-t2i model with your generation settings, the API renders, and the node returns the image. There's no model_version dropdown because there's only one model behind this node. It's the simplest image node in the pack for that reason.

The inputs that matter

• prompt - the whole ballgame, since there's nothing else to condition on.
• guidance_scale - 1.0 to 10.0, default 5. How hard the model sticks to your prompt. Push up for literal prompts, down if you want the model to breathe.
• size - a preset combo (the recommended sizes), with width and height as manual overrides up to 8192px.
• seed - from -1 (random) up to 2^31-1. Set a fixed seed for reproducible results.
• generation_count - up to 2048; batch a whole grid of images in one go.
• watermark - off by default; turn on if your use case needs the platform watermark.

Outputs

• image - the generated image as a ComfyUI IMAGE.
• response - the raw API response JSON, useful when you need the task details or want to debug.

Installing and the thing to watch

Standard pack install: ComfyUI Manager (search "ComfyUI Jimeng API") or git clone https://github.com/fkxianzhou/ComfyUI-Jimeng-API into custom_nodes, restart. The volcengine-python-sdk[ark] dependency installs itself. The usual pack quirks apply - legacy UI only, ByteDance content moderation on prompts.

The node-specific watch is the deprecation: expect quota to shrink and errors to creep in as the platform retires doubao-seedream-3-0. The README's advice is direct - move to Seedream 5, which gives you the same prompt-to-image flow plus reference images and group generation. Seedream 3 was great for its time; this is the part where you gently migrate.