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N8n Integration

Connect n8n workflow automation to LLM API for AI-powered workflows

n8n is a powerful workflow automation tool that can be enhanced with AI capabilities through LLM API. This guide shows how to integrate LLM API into your n8n workflows.

n8n workflow with LLM API

Prerequisites

  • An LLM API account with an API key
  • n8n instance (self-hosted or cloud)
  • Basic understanding of n8n workflows

Setup

The easiest way to use LLM API with n8n is through the OpenAI node with custom configuration.

Add OpenAI Credentials

  1. In n8n, go to Settings → Credentials

n8n credentials

  1. Click Add Credential → OpenAI

n8n credentials

  1. Configure as follows:
    • API Key: Your LLM API API key
    • Base URL: https://internal.llmapi.ai/v1
    • Organization ID: Leave blank

n8n credentials

Configure OpenAI Node

  1. Add an AI Agent node to your workflow
  2. Add a Chat Model edge to the node

n8n credentials

  1. Configure the node to use the LLM API provider

n8n credentials

Note: You have to toggle off the responses API. LLM API does not support it.

responses api

  1. Select your desired options
  • Model: Use any LLM API model ID (e.g., gpt-5)
  • Options: Optionally, configure LLM parameters

n8n credentials

Test Workflow

Finally, try running your workflow with a test prompt.

n8n credentials

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Prerequisites
Setup
Add OpenAI Credentials
Configure OpenAI Node
Test Workflow