ChatGPT API for Business Automation 2025: Complete Integration Guide + Cost Calculator

ChatGPT API: The Business Automation Game-Changer

More than 1 million businesses worldwide now use OpenAI's APIs—making it the fastest-growing business platform in history. From Morgan Stanley's financial advisors to Shopify's e-commerce experiences, ChatGPT API is revolutionizing how companies automate operations.

OpenAI API Pricing 2025: Complete Breakdown

Understanding OpenAI's pricing is crucial for budgeting. Here's the current pricing structure:

Cost Optimization Strategies (Save 60-80%)

Real Business Use Cases

ChatGPT API + n8n Integration

Here's how to connect ChatGPT API with n8n for powerful automations:

// n8n HTTP Request Node Configuration
{
  "method": "POST",
  "url": "https://api.openai.com/v1/chat/completions",
  "headers": {
    "Authorization": "Bearer YOUR_API_KEY",
    "Content-Type": "application/json"
  },
  "body": {
    "model": "gpt-4o-mini",
    "messages": [
      {
        "role": "system",
        "content": "You are a helpful assistant."
      },
      {
        "role": "user",
        "content": "{{ $json.emailContent }}"
      }
    ],
    "max_tokens": 500
  }
}

Top 10 ChatGPT Automation Workflows

1. Email Classification & Routing - Auto-categorize incoming emails into Sales, Support, Admin
2. Customer Support Responses - Draft personalized replies to common queries
3. Lead Qualification - Score and prioritize leads based on conversation analysis
4. Content Generation - Create blog posts, social media, product descriptions
5. Meeting Summaries - Transcribe and summarize meeting recordings
6. Code Review Assistant - Review PRs and suggest improvements
7. Data Extraction - Parse invoices, contracts, resumes automatically
8. Translation & Localization - Translate content with cultural context
9. Sentiment Analysis - Monitor brand mentions and customer feedback
10. Report Generation - Create weekly/monthly reports from raw data

Cost Calculator: Estimate Your Monthly Spend

Getting Started: Step-by-Step

1. Create OpenAI Account - Sign up at platform.openai.com
2. Get API Key - Navigate to API Keys section, create new key
3. Set Usage Limits - Configure spending caps in Billing settings
4. Start with GPT-4o Mini - Test with the cheapest model first
5. Connect to n8n/Make - Use HTTP Request node with your API key
6. Monitor Usage - Check dashboard regularly for cost tracking