To get an API key from OpenAI, you will need to sign up for an account on their website. Once you have created an account, you can generate an API key by going to the API section of the website, and clicking on the "Generate API Key" button.
You may also be required to provide some information about how you plan to use the API, and agree to their terms of service before generating the key.
Once you have an API key, you can use it to make requests to the OpenAI API and access the model's capabilities. Be sure to keep your API key secure and do not share it with anyone.
Also, OpenAI has different plans available, please make sure you have access to the plan that meets your requirement.
Is there ChatGPt iOS app?
There is no official ChatGPT iOS app from OpenAI, but there are third-party apps that have been developed using the OpenAI API. These apps can be found on the App Store and typically allow you to interact with the model through a chat interface on your iOS device.
Also, You can make use of Hugging Face's transformers library to build your own iOS app by using GPT-3 or other language models.
Please keep in mind that using the API or one of these third-party apps would require an API key from OpenAI, and usage costs may apply, depending on the plan you have subscribed to.
It's also important to note that OpenAI API is not intended for use in mobile apps.