GPT-4 is a large language model created by OpenAI, and it is the fourth in its series of GPT foundation models. It was initially released on March 14, 2023, and has been made publicly available via the paid ChatGPT Plus subscription. Compared to its predecessor, GPT-3.5, GPT-4 is more creative, collaborative, and capable of solving difficult problems with greater accuracy. Some of the key features of GPT-4 include:

• Multimodal: GPT-4 can accept both text and image inputs and output human-like text.

• Long-form content creation: GPT-4 is capable of handling over 25,000 words of text, allowing for use cases like long-form content creation, extended conversations, and document search and analysis.

• Advanced reasoning capabilities: GPT-4 surpasses ChatGPT in its advanced reasoning capabilities.

• Image analysis: GPT-4 can analyze photos that users upload and generate captions, classifications, and analyses.

• Improved safety and alignment: GPT-4 is 82% less likely to respond to requests for disallowed content and 40% more likely to produce factual responses than GPT-3.5 on internal evaluations.

GPT-4 has been used in various applications, such as language learning, preserving languages, and tutoring chatbots. It has also been used to generate marketing content around game previews, news articles, and moderating gaming discussion boards. GPT-4 is available for developers via a waitlist, and the form asks for specific information regarding how developers plan to use GPT-4. The free version of ChatGPT is still based around GPT 3.5, but GPT-4 is much better and is available in the ChatGPT Plus paid subscription.