Exploring the Mystery of the "gpt2-chatbot" at LMSYS Chatbot Arena

Recently, users at the LMSYS Chatbot Arena stumbled upon a new chatbot named "gpt2-chatbot" that sparked intrigue and curiosity. This bot, seemingly based on the GPT-4 architecture with a knowledge cutoff in November 2023, delivered responses that rivalled or even surpassed those of the GPT-4-0125 model present at the arena. Despite its impressive performance, the "gpt2-chatbot" model does not appear to be manually selectable for head-to-head comparisons.

One user, infinityio, mentioned encountering the same bot and noted its claim to be a GPT-4 model with a November 2023 knowledge cutoff. Another user, TGSCrust, described the bot as being at least on par with GPT-4 Turbo, a significant achievement considering OpenAI's release timeline and model capabilities.

Interestingly, the "gpt2-chatbot" responds differently from other models, suggesting a unique approach or algorithm. Its ability to accurately count letters in phrases, as pointed out by Educational_Grab_473, showcases its precision and potential enhancements over existing models. Talal916 even challenged the bot with a word count request, further highlighting its capabilities.

Despite its impressive performance, some users expressed skepticism about the "gpt2-chatbot." TGSCrust highlighted that the OpenAI model page lists models with different knowledge cutoff dates, such as December 2023 for 0125 and the new turbo, and April 2023 for 1106. This discrepancy raises questions about the origin and legitimacy of the "gpt2-chatbot."

The discussion also touched upon the significance of a new model, with suggestions ranging from a GPT-4 update to a completely new model like GPT-4.5 or even GPT-5. User HideLord noted that the "gpt2-chatbot" seemed better than GPT-4 Turbo and formatted its answers more in the style of Gemini, indicating a potential shift in writing style and capabilities.

Overall, the emergence of the "gpt2-chatbot" has sparked curiosity and debate among users at the LMSYS Chatbot Arena. Its performance, unique characteristics, and origin raise intriguing questions about the future of AI and language models. As users continue to interact with and study this new bot, more insights are expected to emerge, shedding light on its true nature and capabilities.

This blog post is based on a Reddit discussion found on r/LocalLLaMA. The content has been edited and reformatted for clarity and conciseness.