1
Visit platform.openai.com and sign up or log in with your account.
2
Go to API Keys page — click profile icon → "API keys" or visit platform.openai.com/api-keys.
3
Click "Create new secret key", name it (e.g., "LandFeasibility"), then copy the key (sk-proj-...).
4
Add billing in Settings → Billing. OpenAI requires prepaid credits ($5 minimum) to use the API.
5
Paste the key above, enable OpenAI, and click "Save AI Settings".
💰 Pricing
GPT-4o: ~$2.50/1M input tokens, ~$10/1M output tokens. Set usage limits in Billing to avoid unexpected charges.