OpenAI Codex is an artificial intelligence model developed by OpenAI. It parses natural language and generates code in response. It powers GitHub Copilot, a programming autocompletion tool for select IDEs, like Visual Studio Code and Neovim. Codex is a descendant of OpenAI's GPT-3 model, fine-tuned for use in programming applications.
OpenAI released an API for Codex in closed beta. In March 2023, OpenAI shut down access to Codex. Due to public appeals from researchers OpenAI reversed course. The Codex model can still be used by researchers of the OpenAI Research Access Program.

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