This workflow follows the Chainllm → OpenAI Chat recipe pattern — see all workflows that pair these two integrations.
The workflow JSON
Copy or download the full n8n JSON below. Paste it into a new n8n workflow, add your credentials, activate. Full import guide →
{
"nodes": [
{
"parameters": {},
"type": "n8n-nodes-base.manualTrigger",
"typeVersion": 1,
"position": [
48,
-32
],
"id": "85510369-baf3-4217-b739-19587619d534",
"name": "When clicking \u2018Execute workflow\u2019"
},
{
"parameters": {
"promptType": "define",
"text": "Please explain vector databases in simple terms.",
"batching": {}
},
"type": "@n8n/n8n-nodes-langchain.chainLlm",
"typeVersion": 1.8,
"position": [
224,
-32
],
"id": "a7fa159e-4f8f-4d13-a2e1-84982e6e8232",
"name": "Basic LLM Chain"
},
{
"parameters": {
"model": {
"__rl": true,
"value": "gemini-3-pro-preview",
"mode": "list",
"cachedResultName": "gemini-3-pro-preview"
},
"builtInTools": {},
"options": {}
},
"type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
"typeVersion": 1.3,
"position": [
224,
160
],
"id": "e4a76a12-8c23-485c-a37e-d70671d97a89",
"name": "OpenAI Chat Model",
"credentials": {
"openAiApi": {
"name": "<your credential>"
}
}
},
{
"parameters": {
"modelId": {
"__rl": true,
"value": "gpt-4o",
"mode": "id"
},
"responses": {
"values": [
{
"content": "Please provide a simpler explanation."
}
]
},
"builtInTools": {},
"options": {}
},
"type": "@n8n/n8n-nodes-langchain.openAi",
"typeVersion": 2.1,
"position": [
512,
-32
],
"id": "db35827e-1a8d-454e-9763-68a2febb62f0",
"name": "Message a model",
"credentials": {
"openAiApi": {
"name": "<your credential>"
}
}
}
],
"connections": {
"When clicking \u2018Execute workflow\u2019": {
"main": [
[
{
"node": "Basic LLM Chain",
"type": "main",
"index": 0
}
]
]
},
"Basic LLM Chain": {
"main": [
[
{
"node": "Message a model",
"type": "main",
"index": 0
}
]
]
},
"OpenAI Chat Model": {
"ai_languageModel": [
[
{
"node": "Basic LLM Chain",
"type": "ai_languageModel",
"index": 0
}
]
]
}
},
"meta": {
"templateCredsSetupCompleted": true
}
}
Credentials you'll need
Each integration node will prompt for credentials when you import. We strip credential IDs before publishing — you'll add your own.
openAiApi
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About this workflow
Api Two Stage. Uses chainLlm, lmChatOpenAi, openAi. Event-driven trigger; 4 nodes.
Source: https://github.com/mlsys-io/FlowMesh/blob/97e29953a246f1fa6d9a30bf158664553d5c70d3/examples/templates/n8n/api_two_stage.json — original creator credit. Request a take-down →
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