Due to concerns about malicious applications, GPT2 will not be released (2019)

Overview

Better language models and their implications We’ve trained a large-scale unsupervised language model which generates coherent paragraphs of text, achieves state-of-the-art performance on many language modeling benchmarks, and performs rudimentary reading comprehension, machine translation, question answering, and summarization—all without task-specific training. Our model, called GPT‑2 (a success...

Summary from openai.com.