ByteDance Seedream V4.5 (Official Edition)

ByteDance's Seedream V4.5 text-to-image, reached through the official API route and served as a ComfyUI node by BizyAirPlus. Prompt and size in, a 2048x2048 image out, nothing local involved.

Seedream is ByteDance's closed flagship image line, and V4.5 sits in the interesting middle: newer than V4, less hyped than the V5.0 lite and Pro releases that followed. For a lot of work, that middle spot is exactly right - it's the generation many people found to be the quality/price balance point before the 5.x line landed, and it's still there when you want a solid, well-behaved text-to-image pass through the official route. If you're deciding between the Seedream versions, think of it as: V4 for the plain ask, V4.5 for a step up, 5.0 lite for the new default, 5.0 Pro when you need the best and the budget allows.

How it works

Output node in the BizyAirPlus cloud layer. Flip BizyAirPlus ON in the action bar and the node forwards your prompt and size to Seedream's service via the vendor's direct API, then returns the finished image to your workflow. No weights are ever downloaded - the model is closed, and your machine is just the remote control.

The inputs that matter

• prompt - multiline, free-form. Descriptive natural language gets the best results.
• size - a plain string giving output dimensions in pixels, default 2048x2048.

The optional pair is shared across every BizyTRD node: api_config (override the base URL and API key for one request) and skip_error (emit a placeholder on failure instead of aborting the workflow).

The outputs

image is an IMAGE tensor - save it, upscale it, wire it into anything else on the canvas. urls is the direct result link; request_id is the trace ID to keep for support issues.

Installing it

Ships in BizyAirPlus. ComfyUI Manager → search "BizyAirPlus", or:

cd ComfyUI/custom_nodes
git clone https://github.com/siliconflow/BizyAirPlus.git
cd BizyAirPlus
python -m pip install -r requirements.txt

Restart, turn BizyAirPlus ON, key from bizyair.ai (saved at ~/.BizyAirPlus/apikey.ini, or set BIZYAIR_API_KEY). The actual node code is in the bizytrd / bizyair-cloudberry pip packages - light install, no model downloads.

Gotchas

The usual: button OFF or a missing key explains most first-run failures, and the ComfyUI console has the real error. Yes, that BizyAir-as-malware story you may have seen was an old Manager auto-install mixup, fixed, and the pack is a legitimate SiliconFlow product. On the node itself, size is a plain string, so keep the format like 2048x2048. And when you're testing prompts, remember every generation bills your account - a couple of well-thought-out prompts beat a hundred lazy ones.