n8n

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Overview

• One API key for 50+ models (GPT-5.2, Claude Opus 4.5, Gemini 3 Flash Preview, and more)
• The ability to switch models without changing your workflow logic
• Unified billing across providers

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Prerequisites

• An n8n instance (desktop app, self-hosted, or n8n Cloud)
• A NanoGPT account and API key from nano-gpt.com/api

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Step 1: Get your NanoGPT API key

1. Go to nano-gpt.com/api
2. Click “Create New API Key”
3. Copy the key (format: sk-nano-...)
4. Store it securely, you will not be able to view it again

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Step 2: Create OpenAI credentials in n8n

1. Open your n8n instance
2. Go to Credentials in the left sidebar
3. Click + Add Credential
4. Search for and select OpenAI
5. Fill in the fields:

6. Click Save

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Step 3: Use NanoGPT in a workflow

1. Go to Workflows and click + New Workflow
2. Add an OpenAI node or Chat OpenAI node
3. In the node settings:
   • Credential: Select your NanoGPT credential
   • Model: Enter the model name exactly (examples below)
   • Configure your prompt or messages
4. Click Execute Node to test

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Available models

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Example workflows

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Basic chat completion

[Manual Trigger] -> [OpenAI Chat] -> [Output]

OpenAI Chat node:
- Credential: NanoGPT
- Model: openai/gpt-5.2
- Messages: User message from input

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Document summarization

[Webhook] -> [HTTP Request (fetch doc)] -> [OpenAI Chat] -> [Respond to Webhook]

OpenAI Chat node:
- Model: google/gemini-3-flash-preview
- System: Summarize the following document concisely
- User: {{ $json.documentContent }}

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Multi-model comparison

[Input] -> [OpenAI Chat (GPT-4o)] -\
                                  -> [Merge] -> [Compare Results]
[Input] -> [OpenAI Chat (Claude)] -/

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Troubleshooting

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Advanced: HTTP Request node

1. Add HTTP Request
2. Set:
   • Method: POST
   • URL: https://nano-gpt.com/api/v1/chat/completions
   • Authentication: Header Auth
   • Header Name: Authorization
   • Header Value: Bearer sk-nano-YOUR-API-KEY
   • Body Content Type: JSON
   • Body:

{
  "model": "openai/gpt-5.2",
  "messages": [
    { "role": "user", "content": "{{ $json.prompt }}" }
  ]
}

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Related links

• Get API key
• Model pricing
• n8n documentation
• n8n OpenAI node docs