> For the complete documentation index, see [llms.txt](https://alfredo-reyes-montero.gitbook.io/openai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://alfredo-reyes-montero.gitbook.io/openai/products/gpt2.md).

# GPT2

[GPT2 ](https://github.com/openai/gpt-2)(2019) is an AI system that generates text matching its input in subject and tone. For example, when fed the first sentence of George Orwell's novel Nineteen Eighty-Four it produces plausible futuristic fiction set in China. Unlike previous OpenAI products, GPT2 has not been released to the public out of concerns of potential misuse, including applications for writing fake news.

\*\*\*\*\* We have currently released small (124M parameter), medium (355M parameter), and large (774M parameter) versions of GPT-2\*, with only the full model as of yet unreleased. We have also [released a dataset](https://github.com/openai/gpt-2-output-dataset) for researchers to study their behaviors.\*\*\*\*