GPT-4, OpenAI's most powerful large language model (LLM), has been available for months through a subscription to ChatGPT Plus, which costs $20 a month. If you're looking for more accurate responses to your queries, AI-generated images, web browsing, data analysis, and access to different GPT-4 bots all in one place, GPT-4 has proven itself superior to the publicly available GPT-3.5.
Also: How to use ChatGPT Plus: From web browsing to plugins
Don't get me wrong -- GPT-4 can still make blunders, which are often referred to as hallucinations. But if you're looking to get some smart answers to some challenging questions, GPT-4 is the answer. With that in mind, here are the technical differences between the free version of ChatGPT and the paid-for version of GPT-4 in ChatGPT Plus.....more here