On Pi Day (3/14/23), OpenAI unveiled the eagerly awaited successor to GPT-3.5, GPT-4. Despite OpenAI’s efforts to temper expectations, the buzz surrounding GPT-4’s size and capabilities continued to grow at an accelerated pace.

1. It’s larger—though the exact specifications remain undisclosed
2. It’s more intelligent—evidenced partly by standardized test results and partly by individual examples
3. It’s approximately 20x costlier—but this is only due to OpenAI reducing the price of GPT-3.5 by 10x just prior to the launch
4. It’s multi-modal in that it can accept images as input (not output)—however, only one or two select partners currently have access to this feature

As of April 9th, 2023, GPT-4 or GPT-3.5-Plus is available to all OpenAI users. OpenAI is gradually rolling out paid subscriptions to all users, starting with the United States.
In the meantime, you can sign up to the OpenAI waitlist:

1. The waiting list for GPT-4 is here: https://openai.com/waitlist/gpt-4-api
2. The waiting list for GPT-3.5 is here: https://docs.google.com/forms/d/e/1FAIpQLScee6ST3o-kZDjlw1ROfUNyjuRBwGdcoewxjCULNejbP5hdzQ/viewform

If your OpenAI account has GPT-4 enabled, here is how to enable it in ChatGPT for Gmail by cloudHQ:

1. Click on the ChatGPT for Gmail icon in the upper right corner of your browser. If you do not see the ChatGPT for Gmail icon, click on the “extension” icon and you will see the ChatGPT for Gmail icon in the dropdown.
   
   

2. Under General select the model. The Use your own OpenAI API key must be disabled.