Just as gpt2-chatbot was peaking in hype, the chatbot disappeared on Tuesday afternoon.

A notice on LMSYS siteshomepagereads gpt2-chatbot is currently unavailable.

A tweet from the organization later confirmed that the chatbot had been taken offline due to unexpectedly high traffic.

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Photo: Patrick T. Fallon/Bloomberg (Getty Images)

However, LMSYS says to stay-tuned for its broader releases.

Thanks for the incredible enthusiasm from our community!

We really didn’t see this coming.

Instruction prompt: gpt2-chatbot (left) vs. Claude 3 Opus (right)

Instruction prompt: gpt2-chatbot (left) vs. Claude 3 Opus (right)Screenshot: LMSYS Org

lmsys.org (@lmsysorg)April 30, 2024

Online AI communities have gone wild about the anonymous gpt2-chatbot.

One X user claims that gpt2-chatbotnearly coded a perfect clone of the mobile game Flappy Bird.

Another X user says it solved anInternational Math Olympiad problemin one shot.

Reasoning prompt: gpt2-chatbot (left) vs. Claude 3 Opus (right)

Reasoning prompt: gpt2-chatbot (left) vs. Claude 3 Opus (right)Screenshot: LMSYS Org

It was available on Direct Chat or Arena (side-by-side) under the dropdown menu.

LMSYS Org says in itspolicy blogthat certain AI model developers can test anonymous unreleased models before a broader release.

This has led many to believe that gpt2-chatbot is an anonymous model from a major AI developer.

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These models are strictly for testing and wont be listed on the leaderboard until they go public.

LMSYS Org and OpenAI did not immediately respond to Gizmodos request for comment.

It exhibited behavior exclusive to advanced large language models, reasoning well and outlining detailed plans for complicated tasks.

Elon Musk, CEO of Tesla, during a cabinet meeting at the White House in Washington, DC, US, on Thursday, April 10, 2025.

Here are some of our examples comparing gpt2-chatbot (left) and Anthropics Claude Opus model (right).

Dimitris Papailiopoulos asked gpt2-chatbot to solve a math riddle that involves learning some inexplicit rules.

AI largely struggles to answer questions like this.

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However, it seems clear that a power player is behind this AI model.

In the coming weeks, the creator and origins of the gpt2-chatbot will likely become public.

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