Sign in With ChatGPT: Use Your Plan in Other Apps
OpenAI now lets ChatGPT Plus and Pro subscribers use their plan inside 16 partner apps. What it shares, how usage is counted, and the caveat about signing out.
Sign in with ChatGPT now lets Plus and Pro subscribers spend their existing plan allowance inside participating third-party apps. OpenAI announced the expansion at DevDay on 29 September, and the Runtime Wire keynote roundup says the allowance in question is the Work and Codex usage in the plan, available in 16 launch apps including Devin, Notion and Vercel. One detail matters more than the rest: signing out of an app does not disconnect it.
How Sign in with ChatGPT works
The feature is in limited preview, and Notebookcheck's breakdown gives the working rules:
Requests from the app count toward the ChatGPT Work and Codex usage included in your plan, at a speed that depends on the app and the task.
The connected app receives your name, email address and profile picture. It does not receive your conversations, memories or API keys.
You can cap each connected app by setting the share of your overall weekly usage it may consume.
An app can touch purchased credits only with explicit permission, and only when its limit is set to 100 percent.
The sign-out catch
According to the same report, signing out of the app only ends your session there. The app stays connected to ChatGPT and can keep using your plan. To cut it off, you disconnect it from ChatGPT under Settings, then Security.
That is the same pattern we describe in why broad OAuth grants are a mistake: a connection outlives the session that created it, so the grant, not the login, is the thing to manage. After trying any new partner app, open the connected-apps list and confirm it shows what you expect.
What to do as a subscriber
Set a weekly cap on every connected app on day one. A low cap is easy to raise later.
Leave purchased credits out of it unless you have a reason. Keeping an app's limit below 100 percent stops it from drawing on them.
Watch your own usage in the first week, because a background agent in a partner app spends allowance you would otherwise use yourself. The same logic drives our advice on setting spending limits for AI agents.
Review the connected-apps list once a month and remove anything you no longer use. A forgotten connection is an open tap on your allowance, and it costs nothing to close.
Before you connect an app
Four questions are worth a minute each time a new app asks for this:
Who publishes it, and do you already use it for something else?
Can it run tasks while you are away? Background work is where allowance disappears unnoticed.
What cap is it asking for, and is that share of your week reasonable for what it does?
How would you disconnect it later? Note the Settings, then Security path now, while you remember it.
An app that answers none of these clearly is an app to try on a throwaway task first.
What it means if you build apps
The interesting part for builders is the model, not the feature. Normally an app that adds AI pays the inference bill and recovers it through pricing, which is the problem covered in how to add payments to an AI-built app. Here the user brings a plan they already pay for, and the app never handles the model cost. A close cousin is letting users paste their own key, which we cover in how to let users bring their own API key.
I could not confirm from the sources how an app becomes a partner, what review it needs, or whether the program will open beyond the current 16 apps. Until OpenAI publishes that, treat it as something to watch, not something to design a product around. The wider picture of building with AI is in our guide to building an app with AI.
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About the author
Senior Editor, AI & Product
Cecilia leads the Swarmz editorial desk. She has spent a decade turning complex AI and product topics into writing people actually finish, and she owns the blog's quality bar.
