Automate Gmail email categorization with GPT-4o AI and reasoning

An AI inbox labelling manager that has reasoning attached to the ChatGPT inbox manager within n8n. Super simple yet highly effective automation.

How it works:

• Monitors Gmail inbox → triggers workflow when a new unread email is received.

• Fetches email details including subject, body, and sender information.

• Sends email content to OpenAI → uses AI to determine the most relevant label based on predefined rules.

• AI uses a think tool → justifies why it selected that specific label.

• Retrieves Gmail label IDs → matches AI’s choice to correct Gmail label for that email.

• Adds the chosen label (e.g., Positive reply, priority email, etc) to the email automatically → optionally marks it as read/starred.