Use VieNeu in ChatGPT

ChatGPT connects to custom MCP servers through developer mode. The audio plays in the inline player under the reply.

You need: ChatGPT Plus, Pro, Business, Enterprise or Edu, on chatgpt.com (the web). The Free plan cannot add custom apps. On Business and Enterprise, a workspace admin may have to allow developer mode or custom apps first. And a VieNeu account with an active token plan.

note

ChatGPT's menus for custom apps have been renamed several times. The steps below match OpenAI's guide as of October 2026; if a label differs, look for "Developer mode" and "add app / connector" in the same area.

Add the app

1. Open Settings → Security and login and turn on Developer mode.
2. Open Plugins (apps) and click + to create one.
3. Fill in:
   • Name: VieNeu
   • Description: Vietnamese text-to-speech
   • Server URL / Connection: https://api.vieneu.io/mcp
   • Authentication: OAuth
4. Create it. ChatGPT registers itself with VieNeu automatically and opens the VieNeu page: sign in if asked, check the account and press Cho phép (Allow).
5. ChatGPT lists the five VieNeu tools. The app appears under Drafts.

ChatGPT does not support API keys for custom apps — use sign-in.

Use it in a chat

1. In a new chat, open + → Developer mode and select VieNeu.
2. Ask, for example: "Tìm giọng nam miền Nam đọc tin tức, rồi đọc đoạn sau…"
3. ChatGPT asks you to confirm before a tool that makes something (like text_to_speech) runs — confirm it. Each synthesis spends tokens.

Remove it

• In ChatGPT: remove the app from Plugins (or turn developer mode off).
• On VieNeu: Developer → Dùng VieNeu trong Claude, ChatGPT → Gỡ kết nối.

Problems

Symptom	Fix
No "Developer mode" option	Your plan or workspace does not allow it — see You need above
The VieNeu page warns the app "calls itself ChatGPT" but goes elsewhere	Do not allow it: the request did not come from ChatGPT. Real ChatGPT returns to chatgpt.com
Tools are missing after an update	Open the app under Drafts and click Refresh

More in Troubleshooting.