
GPT-5 & Veo-3 Instagram Video Generator & Autopost
Description
Categories
🤖 AI & Machine Learning
Nodes Used
n8n-nodes-base.ifn8n-nodes-base.waitn8n-nodes-base.waitn8n-nodes-base.stickyNoten8n-nodes-base.stickyNoten8n-nodes-base.stickyNoten8n-nodes-base.stickyNoten8n-nodes-base.httpRequestn8n-nodes-base.httpRequestn8n-nodes-base.httpRequest
PriceFree
Views1
Last Updated2/16/2026
workflow.json
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"name": "GPT-5 & Veo-3 Instagram Video Generator & Autopost",
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"id": "a8d50f46-720d-4a84-addd-138005ca4f4e",
"name": "When chat message received",
"type": "@n8n/n8n-nodes-langchain.chatTrigger",
"position": [
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"name": "30 Wait",
"type": "n8n-nodes-base.wait",
"position": [
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"parameters": {
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"name": "If",
"type": "n8n-nodes-base.if",
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"parameters": {
"options": {},
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
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"combinator": "and",
"conditions": [
{
"id": "57f70829-d058-494e-b438-7ce9dc8a6384",
"operator": {
"name": "filter.operator.equals",
"type": "string",
"operation": "equals"
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"leftValue": "={{ $json.data.status }}",
"rightValue": "processing"
}
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"typeVersion": 2.2
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{
"id": "2dd5d111-0756-4bbf-9c94-e699740ee471",
"name": "Wait 30 Secs",
"type": "n8n-nodes-base.wait",
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{
"id": "f1da4e26-5fd2-428c-b8ab-175e9dd48caf",
"name": "Veo3 Video Generator",
"type": "n8n-nodes-base.httpRequest",
"position": [
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"parameters": {
"url": "https://api.wavespeed.ai/api/v3/google/veo3-fast",
"method": "POST",
"options": {
"redirect": {
"redirect": {}
}
},
"sendBody": true,
"authentication": "genericCredentialType",
"bodyParameters": {
"parameters": [
{
"name": "duration",
"value": "8"
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{
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"value": "true"
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{
"name": "generate_audio",
"value": "true"
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{
"name": "prompt",
"value": "={{ $json.message.content }}"
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{
"id": "f8f54a04-bf64-44c0-9e1a-a9124cbcf1a6",
"name": "GPT-5 AI Video Prompt Agent",
"type": "@n8n/n8n-nodes-langchain.openAi",
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"parameters": {
"modelId": {
"__rl": true,
"mode": "list",
"value": "gpt-5"
},
"options": {},
"messages": {
"values": [
{
"content": "={{ $json.chatInput }}"
},
{
"role": "system",
"content": "You are a creative video prompt generator for short-form reels (e.g., Instagram, TikTok). Based on:\n\nThe chat input of the user\n\nYour task is to craft an elaborate, visually descriptive video generation prompt suitable for input into the Seedance/Veo3 API.\n\n🛑 Do not include any extra explanation, formatting, or commentary. Your entire output must be the exact prompt to pass into the video generator.\n\nThe prompt should:\n– Be under 150 words\n– Describe the visual elements, tone, and motion clearly\n– Reflect the thematic visual in a coherent manner\n\nExample of your expected output format:\n\n“A close-up slow-motion shot of a glass perfume bottle as morning sunlight filters through mist. The background shows soft-focus wildflowers, matching the theme of natural beauty and calm. Overlay text: ‘Nature’s Elegance. Reinvented.’ Trend-inspired styling based on the ‘quiet luxury’ aesthetic. For Instagram.”"
}
]
}
},
"typeVersion": 1.8
},
{
"id": "6de2d985-0c27-40f9-91e0-5858484dd673",
"name": "Veo3 GET",
"type": "n8n-nodes-base.httpRequest",
"position": [
2420,
60
],
"parameters": {
"url": "=https://api.wavespeed.ai/api/v3/predictions/{{ $json.data.id }}/result",
"options": {
"redirect": {
"redirect": {}
}
},
"authentication": "genericCredentialType",
"genericAuthType": "httpHeaderAuth"
},
"typeVersion": 4.2
},
{
"id": "90d33010-21e2-44be-a93f-8d09d5b2c38f",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
1280,
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],
"parameters": {
"color": 6,
"width": 1800,
"height": 480,
"content": "Video Generation"
},
"typeVersion": 1
},
{
"id": "b3d557fb-7291-4223-be37-079cf1304109",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
1280,
460
],
"parameters": {
"color": 4,
"width": 560,
"height": 240,
"content": "Caption Agent"
},
"typeVersion": 1
},
{
"id": "df9f1ce6-6db6-4dd9-8997-d0e76ca27b29",
"name": "Upload to Postiz",
"type": "n8n-nodes-base.httpRequest",
"position": [
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],
"parameters": {
"url": "https://api.postiz.com/public/v1/upload",
"method": "POST",
"options": {},
"sendBody": true,
"contentType": "multipart-form-data",
"authentication": "genericCredentialType",
"bodyParameters": {
"parameters": [
{
"name": "file",
"parameterType": "formBinaryData",
"inputDataFieldName": "data"
}
]
},
"genericAuthType": "httpHeaderAuth"
},
"typeVersion": 4.2
},
{
"id": "3231c09a-afbc-4eb4-ac9e-599ced770916",
"name": "Download Video",
"type": "n8n-nodes-base.httpRequest",
"position": [
1920,
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],
"parameters": {
"url": "={{ $('Veo3 GET').item.json.data.outputs[0] }}",
"options": {
"response": {
"response": {
"responseFormat": "file"
}
}
}
},
"typeVersion": 4.2
},
{
"id": "b57b7a80-ed39-4edf-aa13-f340f7b73eee",
"name": "POSTIZ Post to Socials (IG)",
"type": "n8n-nodes-base.httpRequest",
"position": [
2380,
500
],
"parameters": {
"url": "https://api.postiz.com/public/v1/posts",
"method": "POST",
"options": {},
"jsonBody": "={\n \"type\": \"now\",\n \"shortLink\": false,\n \"date\": \"{{ $now.toISO() }}\",\n \"tags\": [],\n \"posts\": [\n {\n \"integration\": { \"id\": \"{{ YOUR_POSTIZ_INTEGRATION_ID }}\" },\n \"value\": [\n {\n \"content\": \"{{ $('GPT-5 Caption Agent').item.json.message.content }}\",\n \"image\": [\n {\n \"id\": \"{{ $node['Upload to Postiz'].json.id }}\",\n \"path\": \"{{ $node['Upload to Postiz'].json.path }}.mp4\"\n }\n ]\n }\n ],\n \"settings\": {\n \"post_type\": \"post\"\n }\n }\n ]\n}\n",
"sendBody": true,
"specifyBody": "json",
"authentication": "genericCredentialType",
"genericAuthType": "httpHeaderAuth"
},
"typeVersion": 4.2
},
{
"id": "3691e403-be44-4668-bd4d-1613118d0291",
"name": "GPT-5 Caption Agent",
"type": "@n8n/n8n-nodes-langchain.openAi",
"position": [
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"parameters": {
"modelId": {
"__rl": true,
"mode": "list",
"value": "gpt-5"
},
"options": {},
"messages": {
"values": [
{
"content": "=Based on this video generation prompt, create an impactful accompanying caption for the Instagram Post: {{ $('GPT-5 AI Video Prompt Agent').item.json.message.content }}"
},
{
"role": "system",
"content": "You're an Instagram Caption copywriter. You'll receive a set of video prompt message that is used for generating an Instagram short reel video. Your job is to write an effective accompanying caption. Language style should be playful and impactful."
}
]
}
},
"typeVersion": 1.8
},
{
"id": "f8adb7e9-5553-4cd7-8952-caf0a7d7095a",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
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],
"parameters": {
"color": 3,
"width": 780,
"height": 240,
"content": "Postiz - Post to Social Channels"
},
"typeVersion": 1
},
{
"id": "143b00ba-76d2-4a4d-986a-90b53c84f91c",
"name": "Sticky Note3",
"type": "n8n-nodes-base.stickyNote",
"position": [
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-60
],
"parameters": {
"color": 5,
"width": 1000,
"height": 1220,
"content": "🚀 GPT-5 + Veo-3 Instagram Reel Auto-Creator & Auto-Poster\n\nDescription:\nThis n8n workflow is a fully automated short-form video content engine that takes your creative idea, turns it into a cinematic video using Google Veo-3 via Wavespeed API, writes an engaging Instagram caption with GPT-5, and instantly posts it to Instagram via Postiz—all without lifting a finger.\n\nIt’s designed for content creators, social media managers, and brands who want to produce high-quality, on-brand reels at scale without manual editing or posting.\n\nWatch Step-by-step build:\nwww.youtube.com/@automatewithmarc\n\n💡 Key Features:\n💬 Chat-Triggered Automation (You can replace this with On Schedule trigger for automated generation) – Start the workflow with a simple message describing your video idea.\n\n🧠 GPT-5 Video Prompt Agent – Transforms your concept into a visually rich, cinematic prompt optimized for Veo-3.\n\n🎥 Veo-3 AI Video Generation – Creates a polished short-form reel with cinematic motion, effects, and branding.\n\n✍️ GPT-5 Caption Writer – Crafts an impactful, scroll-stopping caption tailored for Instagram engagement.\n\n📤 Auto-Posting with Postiz – Uploads and schedules (or instantly posts) your reel to Instagram without manual steps.\n\n⏳ Automated Progress Checking – Wait & retry logic ensures posting only happens when the video is fully generated.\n\n🔧 Tech Stack:\nGPT-5 via OpenAI API – AI for prompt engineering & caption creation.\n\nGoogle Veo-3 (via Wavespeed API) – Next-gen text-to-video model for short-form content.\n\nPostiz API – Multi-platform social media posting automation.\n\nn8n – Orchestration & automation engine.\n\n📌 Ideal Use Cases:\nInstagram Reels / TikTok Creators who want to post daily without editing.\n\nFitness, Fashion, Travel & Lifestyle Brands looking for high-quality, thematic reels.\n\nSocial Media Agencies producing client content at scale.\n\nEvent Marketers creating same-day recap videos.\n\n🛠 Setup Instructions:\nAdd your API keys for OpenAI (GPT-5), Wavespeed (Veo-3), and Postiz.\n\nConnect Postiz to your Instagram account.\n\nTrigger the workflow with a chat message describing your desired video.\n\nWatch your idea transform into a reel—fully captioned and posted automatically.\n\n🎯 Why This Workflow Stands Out:\nEnd-to-end automation from idea → video → caption → Instagram post.\n\nAI-driven creative consistency for brand identity.\n\nScales your content production without hiring editors.\n\nSEO & engagement-ready captions crafted for social virality."
},
"typeVersion": 1
}
],
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"pinData": {},
"settings": {
"executionOrder": "v1"
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"connections": {
"If": {
"main": [
[
{
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[
{
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"type": "main",
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}
]
]
},
"30 Wait": {
"main": [
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{
"node": "Veo3 GET",
"type": "main",
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}
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"Veo3 GET": {
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},
"Download Video": {
"main": [
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{
"node": "Upload to Postiz",
"type": "main",
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}
]
]
},
"Upload to Postiz": {
"main": [
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{
"node": "POSTIZ Post to Socials (IG)",
"type": "main",
"index": 0
}
]
]
},
"GPT-5 Caption Agent": {
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"When chat message received": {
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{
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}
}