OpenAI’s ‘Leaked’ GPT2 Model Has Everyone Stunned.

On-Purpose leak?

The influence that OpenAI has on the AI industry can’t be overstated. Every move or decision makes headlines automatically… even if they don’t actually announce the thing.

A few days ago, a model many of us played with that has since been deleted has the entire AI industry fascinated. Named “gpt2-chatbot” it was accessible for a few days in the ‘Direct Chat’ function in lmsys.org.

But why so much fuss?

Well, because this model is unlike anything we have ever seen. It’s on a completely different level.

For this reason, many believe it has been the unofficial teaser of ChatGPT-4.5 or even GPT-5. Or, even more exciting, using the number ‘2’ as a signal that a new GPT generation of long-inference models is approaching.

Even Sam Altman, CEO of OpenAI, couldn’t resist the temptation to acknowledge its existence and tease us in the process:

So, how good is this model, and what on Earth is it?