API Nodes are ComfyUI’s new way of calling closed-source models through API requests, providing ComfyUI users with access to external state-of-the-art AI models without complex API key setup.

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What are API Nodes?

API Nodes are a set of special nodes that connect to external API services, allowing you to use closed-source or third-party hosted AI models directly in your ComfyUI workflows. These nodes are designed to seamlessly integrate the capabilities of external models while maintaining the open-source nature of ComfyUI’s core.

Currently supported models include:

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How to Use API Nodes

Using API Nodes requires a few simple steps:

  1. Find the API nodes: You can find them under the “API Nodes” category in the node menu, or through the search function
  2. Log in: Using API nodes requires you to log in to your Comfy Org account, which you can access in the settings menu under the User section
  3. Credits: API calls use a prepaid system, you can purchase credits in Settings → Credits
  4. Add to workflow: Add API nodes to your workflow just like any other node
  5. Run: After setting the parameters, run your workflow

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Advantages of API Nodes

API Nodes provide several important advantages for ComfyUI users:

  • Access to closed-source models: Use state-of-the-art AI models without having to deploy them yourself
  • Seamless integration: API nodes are fully compatible with other ComfyUI nodes and can be combined to create complex workflows
  • Simplified experience: No need to manage API keys or handle complex API requests
  • Controlled costs: The prepaid system ensures you have complete control over your spending with no unexpected charges

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About Open Source and Opt-in

It’s important to note that API Nodes are completely optional. ComfyUI will always remain fully open-source and free for local users. API nodes are designed as an “opt-in” feature, providing convenience for those who want access to external SOTA (state-of-the-art) models.

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Use Cases

A powerful application of API Nodes is combining the output of external models with local nodes. For example:

  • Using GPT-Image-1 to generate a base image, then transforming it into video with a local wan node
  • Combining externally generated images with local upscaling or style transfer nodes
  • Creating hybrid workflows that leverage the advantages of both closed-source and open-source models

This flexibility makes ComfyUI a truly universal generative AI interface, integrating various AI capabilities into a unified workflow, opening up more possibilities

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Frequently Asked Questions

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