ChatGPT Login Issues: How to Fix It

Try these in order

1. Clear your browser's cache and cookies, then try again. This is OpenAI's first suggestion for anyone who could log in before but suddenly can't (OpenAI Help Center).
2. Use the same sign-in method you originally signed up with. If you created your account with "Continue with Google," "Continue with Microsoft," or "Continue with Apple," you have to keep using that button — mixing methods triggers "There is already a user with email…" or "Wrong authentication method" (OpenAI Help Center).
3. Try an incognito window or a different browser or device. Extensions, cached data, outdated browsers and unusual device configurations can all block login, and a clean window rules them out (OpenAI Help Center).
4. Break a "Checking your browser…" loop. Turn off any VPN or proxy and refresh, temporarily disable ad blockers, privacy tools and script blockers, and make sure cookies (including third-party cookies) and JavaScript are allowed for chatgpt.com, openai.com and auth.openai.com (OpenAI Help Center).
5. Switch networks. Moving from corporate Wi-Fi to mobile data often fixes both verification loops and "We have detected suspicious login behavior" warnings (OpenAI Help Center).
6. Check for a hidden Apple relay email. If you signed up with Apple and used "Hide My Email," your account is tied to an @privaterelay.appleid.com address — signing in with your personal email won't find it (OpenAI Help Center).
7. If sign-up says "This user already exists," log in instead. That message usually means you started signing up before without finishing, so the account already exists and just needs a login at chatgpt.com/auth/login (OpenAI Help Center).