The easiest way to access ChatGPT on an iPhone is to download the official ChatGPT app from the App Store. Check that the developer is OpenAI OpCo, LLC. You can also open chatgpt.com in Safari; OpenAI says you can try ChatGPT before creating an account. If either route asks you to sign in, use an existing account or follow the on-screen steps to create one. OpenAI’s cited iOS app guidance does not establish whether every user must sign in before chatting. You do not need to set up a production API for ordinary ChatGPT use. (OpenAI’s app FAQ; The ChatGPT home page)
Option 1: Install the official ChatGPT app
- Open the App Store on your iPhone.
- Search for OpenAI ChatGPT, or follow the app link in OpenAI’s download instructions.
- Before downloading, check the listing’s developer name: it should be OpenAI OpCo, LLC.
- Download the app, then open it.
- If the app asks you to sign in, use your ChatGPT account. If you don’t have one, follow the app’s account-creation prompts. The cited iOS app guidance does not say whether sign-in is required for every user.
- To start a chat, enter a prompt in the message box and send it.
OpenAI directs users to check the App Store listing for the latest device and operating-system compatibility requirements. App availability depends on whether your country or region is supported. (OpenAI’s app FAQ)
Option 2: Use ChatGPT in Safari
- Open Safari and go to
chatgpt.com. - Try entering a prompt. OpenAI says ChatGPT can be tried before creating an account. If the site asks you to sign in or create an account, follow its prompts to continue. The cited guidance does not specify every circumstance in which sign-in is required. (The ChatGPT home page)
Do you need a production API?
No—not for ordinary ChatGPT use on your iPhone. Use the ChatGPT app or website. The API platform is a separate developer product, and OpenAI says its billing is separate from ChatGPT billing. You only need to look into the API if you’re developing software that connects to OpenAI’s models; you don’t need API credentials just to chat. (OpenAI’s billing guidance)
If you can’t find or install the app
Check that the App Store listing is published by OpenAI OpCo, LLC. For device or software compatibility, check the listing; for supported locations, consult OpenAI’s supported-countries information. You can also try chatgpt.com in Safari and follow any sign-in prompt it shows. (OpenAI’s app FAQ)
Sources
ChatGPT iOS and Android app FAQ
Where can I download the OpenAI ChatGPT iOS app on the Apple App Store?