An unknown gpt2-chatbot is blowing up on X: Is this OpenAI’s GPT-5 upgrade?

ChatGPT is easily the best-known generative AI chatbot in the world, but it offers different experiences depending on whether or not you pay for a premium LLM. The free ChatGPT runs on the GPT-3.5 model, while ChatGPT Plus and enterprise subscriptions have access to GPT-4. There's even talk about GPT-4.5 coming out soon, with many people expecting OpenAI to launch a GPT-5 upgrade later this year.

With that in mind, a mysterious GPT2-Chatbot is apparently out in the wild. Some testers are...