In June 2020, OpenAI released version 3 of its Generative Pre-trained Transformer (GPT-3), a natural language transformer that took the tech world by storm with its uncanny ability to generate text seemingly written by humans. But GPT-3 was also trained on computer code, and recently OpenAI released a specialized version of its engine, named Codex, tailored to help — or perhaps even replace — computer programmers.

In a series of blog posts, we explore different aspects of Codex and assess its capabilities with a focus on the security aspects that affect not only regular developers but also malicious users. This is the fourth and final part of the series. (Read the first, second, and third parts.)