Hey, thanks for the feature request. It’s clear what you want: use your own ChatGPT subscription for models inside Cursor.
Right now there isn’t a way to do that. BYOK in Cursor only works with API keys, and a ChatGPT subscription doesn’t include OpenAI API usage, so you can’t “transfer” your subscription allowance into Cursor’s native agent.
The only option today is the OpenAI Codex IDE extension, which supports Sign in with ChatGPT and runs inside Cursor as a separate side panel. Important note: it doesn’t change the model used by Cursor Chat, Agent, Tab, or Cloud Agents. It’s a separate tool in the editor, not part of Cursor’s agent system.
There’s already a separate thread requesting support for external subscription recognition ChatGPT Plus / Claude Pro. It’s best to add votes and discussion there so it’s more visible to the team: Integrate PRO Subscription Recognition (ChatGPT Plus / Claude Pro) to Avoid Duplicate API Costs
If anything changes, the best way to stay updated is to follow that thread.