To add Sign in with ChatGPT to a website, first obtain access to OpenAI’s website integration and an OAuth client, then implement the documented OpenID Connect Authorization Code flow with PKCE. Your backend handles the callback, exchanges the code, validates the ID token, maps the verified identity to a local account, and creates your app’s own session. OpenAI currently describes website access as a limited trial for selected commercial partners, so confirm eligibility before building against the guide’s sample configuration. OpenAI’s website guide is the implementation reference.
Can any developer add Sign in with ChatGPT?
Not necessarily. OpenAI’s website integration guide describes access as a limited trial for selected commercial partners. You need an OpenAI OAuth client and must register the callback URL your app will use. Establish eligibility and obtain the client details before treating the documentation’s illustrative values as your app’s configuration. The user-facing feature is available on participating sites, but that does not mean every developer can self-serve a website client. OpenAI’s website guide covers developer access; its Help Center article describes participating-site availability for users.
How the OAuth sign-in flow works
OpenAI documents Sign in with ChatGPT for websites as OpenID Connect over OAuth 2.0 Authorization Code with PKCE. In practical terms, the browser starts a sign-in request, OpenAI authenticates the user and returns an authorization code to your registered callback, and your server exchanges that code and verifies the resulting ID token. Your application then finds or creates a local account and issues its own session. Use a maintained OAuth/OIDC library where possible rather than implementing protocol details yourself.
- Get an OAuth client. Confirm access, register the exact callback URI for each environment, and confirm the client’s token-endpoint authentication method. A confidential client authenticates with a secret held on the server; a public client does not use a client secret.
- Load OpenID Connect metadata. Fetch OpenAI’s production discovery document and use it to obtain the issuer, authorization endpoint, token endpoint, and JWKS URI. The website guide shows these production examples: issuer
https://auth.openai.com, authorization endpointhttps://auth.openai.com/api/accounts/authorize, token endpointhttps://auth.openai.com/api/accounts/oauth/token, and JWKS URIhttps://auth.openai.com/.well-known/jwks.json. Treat them as documented examples and validate the current metadata when implementing. - Create a protected sign-in transaction on your backend. For each attempt, generate fresh
state,nonce, and PKCE verifier and S256 challenge. Keep the transaction server-side and bind it to a secure browser session. The guide’s illustrative transaction expires after ten minutes; production storage should expire transactions and support atomic, one-time consumption across app instances. - Request identity scopes. Use
openid profile email. Theopenidscope requests an ID token;profileandemailrequest available profile and email claims. - Send the browser to OpenAI’s authorization endpoint. Include the client ID, exact registered redirect URI, requested scopes, state, nonce, and PKCE challenge using the parameters required by the current guide and your OIDC library.
- Validate the callback and exchange the code on the server. Compare returned state with the stored transaction, then send the authorization code, original PKCE verifier, and same redirect URI to the token endpoint. Reject callbacks that do not match the transaction.
- Verify the ID token. Validate its signature using keys from the discovered JWKS URI and check the required claims. In particular, require
issto match the issuer from discovery exactly. Do not treat a decoded token as verified merely because it can be read. - Resolve the app account and create a local session. Map the verified identity to a local user, then issue your site’s own session cookie or equivalent. Keep authorization decisions and session handling within your application.
See OpenAI’s website integration guide for the current parameters and implementation details. Do not put a confidential client secret or an OpenAI API key in browser code. OpenAI’s API authentication reference warns that API keys are secrets and must not be exposed client-side.
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What information does Sign in with ChatGPT share?
For identity sign-in, OpenAI says the external app receives the user’s name, email address, and profile picture if available. Sign-in alone does not grant access to ChatGPT conversations, memory, files, tokens, billing information, or other ChatGPT account data. Any additional delegated access requires a separate permission flow, as described in the Sign in with ChatGPT Help Center article.
Who owns accounts, permissions, and sessions?
Your web app does. The verified OpenID identity is an input to your own account system, not a replacement for it. OpenAI Developers’ quickstart states: “Your application owns account creation, enterprise sign-in policy, sessions, authorization, and connector access.” Plan how you will create or link accounts, apply your organization’s sign-in rules, authorize users within the app, and manage app sessions. Account-linking decisions deserve particular care: use verified identity data, and define how your site handles an existing account with the same email rather than assuming email alone is a safe account key.
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Is identity sign-in the same as granting access to ChatGPT or OpenAI products?
No. The identity scopes above establish who the user is; they do not expose ChatGPT conversations or OpenAI API resources. If your app separately supports ChatGPT plan usage for eligible AI requests, that uses a distinct authorization flow and scopes. Keep that consent separate from basic login, and explain any additional requested access to users. OpenAI distinguishes these capabilities in its quickstart.
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