Symbiotica Wavespeed Nano Banana 2 Fast

The "Fast" variant of Symbiotica's Nano Banana 2 text-to-image node, and the name is the review: it's the same Google Gemini 3.1 Flash image model over Wavespeed's hosted API, tuned for speed instead of choices. You trade the 0.5k/1k resolutions and the image-search grounding away and keep the essentials.

This is the node you reach for when you're iterating - testing prompts, trying five aspects of one idea, building a draft to take into an edit step. When the draft needs to be final, use the full node instead.

What's different from the full node

• resolution only offers 2k (default) and 4k - no half-k or 1k drafts.
• No enable_image_search; web-search grounding only (enable_web_search, off by default).
• timeout defaults to 180s instead of 300, since the fast endpoint is meant to finish sooner.

Everything else is familiar: prompt (required, non-empty), aspect_ratio (auto or the 15-ratio list), output_format (png/jpeg), optional api_key, and the same three outputs - image, task_id, result_url.

Install

One node of the Symbiotica pack:

cd ComfyUI/custom_nodes
git clone https://github.com/symbiotica-ai/comfyui-nodes.git symbiotica
pip install -r symbiotica/requirements.txt

Restart ComfyUI, or ComfyUI Manager → search Symbiotica → install. Needs a Wavespeed key: Settings → Symbiotica, or export WAVESPEED_API_KEY=.... Nothing heavy downloads for this node.

Common issues

• The usual mutex trap is gone here - there's only web search, so no "can't both be on" error. Small mercy.
• Timeout at 180s - if the fast endpoint runs long (heavy search grounding, 4K), bump timeout. It's not a fixed hard cap, just a default.
• "Wavespeed API key required" - same as the full node: set it in Settings or as the env var.

A closing thought: "fast" here means the endpoint, not that you should skip checking the result. Draft with this, then take the winners into the edit node - that split is the reason the pack ships four variants of the same model.