OpenRouter Generate Image

OpenRouter's whole pitch is one API key, many models - you don't maintain separate accounts with every provider, you just call openrouter.ai with a model slug. YogurtOpenRouterGenerateImage is that pitch wired into your graph: pick a model by name, generate an image, and get back a proper IMAGE tensor.

Day-one inputs:

• api_key - your OpenRouter key (or fall back to api_key.json / OPENROUTER_API_KEY).
• model_name - defaults to google/gemini-2.5-flash-image-preview.
• prompt and system_prompt - what to draw and how to frame it.
• temperature, top_p, max_tokens - sampling dials (max_tokens defaults to 8192).
• provider and provider_list - infrastructure preference. provider is a single choice like azure; provider_list takes comma-separated providers (openai,azure,together) and wins when set.
• seed, aspect_ratio, image_size - the last defaults to "1k" and is gemini-only for now.
• retry_count, timeout, proxy_url - resilience.

Optional: image + image1–image4 for edits, history, extra for raw JSON, and return_text - a BOOLEAN that controls whether the response is image+text or image only. Outputs: image, images, num_images, text, history.

Why route through OpenRouter?

Convenience is the honest answer: one key, one billing account, and the ability to swap image models by changing a string instead of reconfiguring a client. If you're already paying for OpenRouter for text, the image node is the same bill. The provider_list/provider controls are the real differentiator - when a model is down at one provider, you can pin the fallback without leaving the node.

That said, the defaults tell you a lot: gemini-2.5-flash-image-preview as the image default and claude-3.5-sonnet for the text twin. OpenRouter is best understood as a router - you get the models OpenRouter has contracts with, not every model ever. If your heart is set on a specific provider's API, the pack's dedicated nodes (YogurtOpenAIGenerateImage, YogurtQwenGenerateImage) are there instead.

Install and keys

Ships in ComfyUI-YogurtNodes. ComfyUI Manager → search ComfyUI-YogurtNodes → install, or:

cd ComfyUI/custom_nodes
git clone https://github.com/yogurt7771/ComfyUI-YogurtNodes.git
cd ComfyUI-YogurtNodes
pip install -r requirements.txt

Restart ComfyUI; it's under "Yogurt Nodes/LLM". Requires the openai Python package (OpenRouter speaks the OpenAI wire protocol) and an OpenRouter key from openrouter.ai/keys.

Gotchas: not every model slug OpenRouter offers is image-capable - the node expects a model that returns images, and you'll get an error or empty output if you point it at a text-only model. And image_size being "gemini only for now" means it's silently ignored by models that don't support it. When in doubt, stick with the default model and read the model's page on OpenRouter before you swap.