This option was designed to provide quick and convenient access to the ChatGPT model for users who wanted to try it out or use it for occasional tasks without the need for a formal subscription.
Instant use typically came with certain limitations, such as a restricted number of tokens (words) per interaction or a limited duration of usage. Users could access ChatGPT through OpenAI's website and initiate conversations with the model, receiving responses in real-time.
However, the availability and details of the "instant use" option may have changed since then. OpenAI often updates its offerings and pricing models, so I recommend visiting the official OpenAI website or checking their latest announcements to get the most current information on how you can use ChatGPT instantly and any associated limitations or restrictions.