How to Humanize AI Text Inside ChatGPT (Developer Mode Connector)

ChatGPT drafts beautifully and humanizes nothing. So the usual routine is: generate in ChatGPT, copy out, humanize elsewhere, paste back. Adding SupWriter as a connector collapses that into a single conversation — ChatGPT calls our humanizer, paraphraser, grammar checker, and AI detector as tools, with your permission, without leaving the chat.

ChatGPT is a little different from Claude here: custom MCP connectors live behind Developer mode, and they need a paid plan. Here's the exact flow.

Before you start

Use ChatGPT on the web (chatgpt.com). Custom connectors can't be added from the mobile apps yet.
You need a paid plan: Plus, Pro, Business, Enterprise, or Edu. Custom connectors aren't available on the Free plan.
On Business/Enterprise, a workspace admin can turn Developer mode off for everyone — if you don't see it, ask your admin.

The 60-second version

Settings → Apps & Connectors → Advanced settings → turn on Developer mode → Create a connector with URL https://supwriter.com/api/mcp and OAuth auth → sign in to SupWriter → enable it in the chat. Then ask ChatGPT to humanize anything.

Step 1: Turn on Developer mode

Click your profile picture (top-right) → Settings → Apps & Connectors. Scroll to the bottom, open Advanced settings, and toggle Developer mode on. Accept the warning — custom connectors run third-party tools on your behalf, so only add servers you trust.

(Some builds still label this tab Connectors rather than Apps & Connectors — it's the same place.)

Step 2: Create the SupWriter connector

Back on the Apps & Connectors screen, click Create. Fill in:

Name — SupWriter
Description (optional) — "Humanize, paraphrase, grammar-check, and AI-detect text."
MCP Server URL — paste:

https://supwriter.com/api/mcp

Authentication — choose OAuth.

Tick "I trust this application" and click Create.

ChatGPT connects to SupWriter over OAuth, not an API key — there's no field to paste a token. That's fine: SupWriter registers ChatGPT automatically, so you don't copy any client ID or secret.

Step 3: Sign in and approve

A SupWriter window opens. Log in with your SupWriter account if you aren't already, then review the consent screen. It lists exactly what's being granted: humanize, paraphrase, grammar-check, and AI detection. Approve, and the connector is linked. (If a window doesn't appear, allow pop-ups for chatgpt.com.)

Step 4: Enable it for the chat and make your first call

Connectors are turned on per conversation. In the message composer, open the + (or Developer mode) menu and switch SupWriter on. Then ask:

"Humanize the draft above with a professional tone."
"Paraphrase this in academic mode."
"Check this text against AI detectors and show me the flagged sentences."

ChatGPT surfaces each tool call for you to Confirm before it runs, then drops the result back into the thread.

Troubleshooting

The connector doesn't appear in a chat. Make sure Developer mode is on, and that SupWriter is toggled on for that specific conversation — connectors are per-chat, and they aren't available in shared chats.
You don't see Developer mode at all. It needs a paid plan and the web app; on Business/Enterprise it may be disabled by an admin.
You get asked to reconnect. OAuth tokens are short-lived; just re-approve. Your SupWriter account stays linked.
INSUFFICIENT_CREDITS / PLAN_LIMIT. You're out of word credits, or the text exceeds your plan's per-request cap (500 free/basic, 1,500 Pro, 3,000 Ultra). Trim the text or top up.
LANGUAGE_NOT_AVAILABLE. That language needs a higher plan; English is available everywhere.