When Microsoft announced the Bing chatbot in February, it said the chatbot would run on a next-generation OpenAI large language model (LLM) customized specifically for search. Microsoft said the next-gen LLM powering the new Bing is faster, more accurate, and "more capable" than ChatGPT or GPT-3.5, the LLM behind ChatGPT. Also: How to use Bing Image Creator (and why it's better than DALL-E 2)Five weeks after launching, Microsoft revealed that Bing Chat runs on OpenAI's latest language model, GPT-4.At the moment, the only free way to access GPT-4 is Bing Chat. GPT-4 is a more reliable, intelligent, and capable model than its predecessor, GPT-3.5. ChatGPT Plus users can access GPT-4 for the price of their Plus accounts.