Direct answer: Sign in with ChatGPT lets you use your ChatGPT identity to enter supported apps and sites. In participating tools, eligible Plus and Pro subscribers can separately allow the app to use their existing ChatGPT Work and Codex allowance for AI requests—without creating or sharing an OpenAI API key.[4]
Before you connect: signing in and sharing plan usage are separate permissions. Check the app’s own subscription price, set a weekly app limit, and remember that an app limit caps your existing allowance; it does not create extra usage.[4][6]
What Sign in with ChatGPT actually does
OpenAI announced Sign in with ChatGPT at DevDay 2026 as a way to use a ChatGPT account across other tools and, for participating apps, apply eligible plan usage outside ChatGPT. Identity sign-in is available globally, while plan usage is limited to eligible Plus and Pro accounts and participating tools.[1][5]
There are two distinct choices:
- Identity sign-in: create, link, or access an account using your ChatGPT identity.
- Plan usage: let an eligible app consume part of the ChatGPT Work and Codex usage already included in your Plus or Pro plan.
You can approve identity sign-in without approving plan usage. A partner may also charge for its own subscription, infrastructure, or premium features even when ChatGPT covers eligible OpenAI-model usage.[4]
Supported apps: plan usage vs sign-in only
OpenAI’s current directory separates tools that can use your plan from tools that currently support identity sign-in only.[6]
Apps with ChatGPT plan usage
| Commercial apps | Open-source integrations |
|---|---|
| Amp Code, Conductor, Dactyl, Devin, Hermes Agent, Hyperagent | OpenClaw, OpenCode |
| Kilo Code, Notion, Vercel, Vorflux, Warp | Pi, T3 |
| Lovable is listed as coming soon | Availability may depend on the integration and version |
Apps currently listed as sign-in only
- Airtable
- Canva
- GitLab
- HubSpot
- Supabase
“Sign-in only” means the ChatGPT account can be used for identity, but the app is not currently listed for ChatGPT plan usage. Partner availability and eligibility can change, so check OpenAI’s live directory and the app’s own account or billing screen before relying on it.[6]
How to use Sign in with ChatGPT
- Open a participating app or site.
- Select Continue with ChatGPT or Sign in with ChatGPT.
- Sign in to the intended ChatGPT account and, if shown, select the correct workspace.
- Review the identity information requested.
- If the app supports it, review the separate Use your ChatGPT plan permission.
- Approve only the permissions you want, then finish the connection.
- Open ChatGPT Settings → Usage and set a weekly limit for the app.
If you already have an account with the partner, look in its account or billing settings for an option to link ChatGPT. Some services may require you to confirm that an existing account should be linked.[4][6]
What information is shared?
For identity sign-in, the external app receives your name, email address, and profile picture, if you have one. Sign in with ChatGPT does not independently share your conversations, memory, files, tokens, billing information, or other ChatGPT account data.[5]
Allowing plan usage also does not, by itself, give the app access to your ChatGPT conversations or memories, and it does not expose an OpenAI API key. However, an app can request other permissions through a separate authorization flow. Read those requests and the partner’s privacy policy before accepting them.[4]
How app usage limits work
In ChatGPT, open Settings → Usage → App limits. Choose the connected app, set the percentage of your overall weekly allowance that it may consume, and save the change.[4]
- An app limit is a cap, not a separate or reserved allowance.
- An app can reach its cap while you still have ChatGPT usage available.
- Connecting an app does not increase your overall plan limits.
- Usage rates can vary by app and task complexity.
- Signing in again or repeatedly retrying does not reset a reached limit.
A cautious starting point is a low weekly percentage for a new app. Increase it only after checking actual usage and confirming that the tool is useful.
Credits and possible extra charges
If your account offers the option, you can separately allow participating apps to use available ChatGPT credits after included usage runs out. This is off by default. OpenAI says an app must have its app limit set to 100% before it can use credits, but setting 100% does not itself enable credit use.[4]
Check automatic credit-purchase settings before enabling this option. If automatic purchases are enabled, continued usage may create charges. Partner fees are separate: an app can still require its own paid plan even when eligible model requests use your ChatGPT allowance.
How to disconnect an app completely
- Open ChatGPT.
- Go to Settings → Security and login.
- Open Sign in with ChatGPT under Login connections.
- Select the app.
- Choose Disconnect and confirm.
Signing out inside the partner app is not the same as disconnecting its ChatGPT authorization. Disconnecting also does not delete information that the partner already received; use the partner’s data controls or contact it separately if you want that data deleted.[4]
Troubleshooting checklist
The button is missing
The app may not support the feature, rollout may not have reached your account, or an organization admin policy may block it. Use another sign-in method or check with the administrator.[5]
Sign-in works but plan usage does not
- Confirm that you use an eligible Plus or Pro account.
- Check whether that specific app supports plan usage, not just identity sign-in.
- Verify that you approved the separate plan-usage permission.
- Check the app’s weekly limit under Settings → Usage.
- Confirm that the partner makes the option available on your app subscription.
The app says you reached a limit
Check both your overall plan allowance and the app-specific percentage. Wait for the reset time shown in settings if either limit has been reached. Reconnecting does not restore usage.[4]
You see unexpected usage
Note the app, task, approximate time, and result. Stop using and disconnect the app if necessary. Contact the app provider for task-level details and OpenAI Support if the recorded ChatGPT usage appears wrong. Never send passwords, API keys, access tokens, refresh tokens, or local credential files to support.[4]
For developers: can you add it to your app?
OpenAI provides developer documentation and a DevKit for open-source tools and local personal projects. The documented integration separates identity from optional plan usage, supports model discovery and streaming responses, and requires clear usage-management controls. Paid or remotely hosted commercial apps must request access rather than assuming the open-source path applies.[7]
A practical implementation checklist:
- request a client ID through the official developer flow;
- keep identity and plan-usage consent visibly separate;
- store tokens securely and implement refresh, logout, and revocation correctly;
- show when a request is using the user’s ChatGPT plan;
- link users directly to ChatGPT usage settings;
- handle exhausted limits and reconnection without consent loops;
- review OpenAI’s terms and the DevKit license before distribution.
Frequently asked questions
Is Sign in with ChatGPT available to free users?
Authenticated users can use identity sign-in where supported. Using a ChatGPT plan for eligible AI requests in another app requires an eligible Plus or Pro plan.[4]
Does it share my ChatGPT history?
No. Identity sign-in does not independently share conversations or memory. Plan usage also does not by itself grant access to them. Review separately requested permissions before approving an app.[4][5]
Do I need an OpenAI API key?
No. The user-facing connection does not require you to create or share an API key.[4]
Will connecting an app give me more ChatGPT usage?
No. App requests count against existing eligible usage. The per-app limit is only a cap and does not add or reserve allowance.[4]
Can an app still charge me?
Yes. The partner can charge separately for its subscription, infrastructure, or premium features. Review the app’s pricing before connecting.[4]
How do I stop an app from using my plan?
Go to ChatGPT Settings → Security and login → Sign in with ChatGPT, choose the app, and disconnect it. Also sign out inside the partner app if you want to end that local session.[4]
Bottom line
Sign in with ChatGPT can reduce password friction and let eligible subscribers use part of their existing AI allowance in supported tools. The sensible setup is simple: verify that the app supports plan usage, approve only the required permissions, start with a low weekly cap, monitor usage, and disconnect tools you no longer trust or use.