Codex by OpenAI
OpenAI's smartest and most intuitive to use model yet
Codex by OpenAI launched on August 11, 2021 with 954 votes, #4 of 2,953 launches that month and more than 99% of that year's launches. The site was not reachable when checked in September 2026.
In plain words
Codex by OpenAI is an AI tool that translates English text into code. It's designed for both professional programmers looking to speed up their work and beginners learning to code. The tool uses machine learning to convert natural language instructions into functioning code across various programming languages.
written from the facts on this page · September 2026
From the sources
OpenAI Codex is a new machine learning tool that translates your text in the English language into code. Codex is designed to speed up the work of professional programmers, as well as help amateurs get started coding.
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Open Codex – OpenAI Codex CLI with open-source LLMs2025 · github.com · ▲106Hey HN, I’ve built Open Codex, a fully local, open-source alternative to OpenAI’s Codex CLI. My initial plan was to fork their project and extend it. I even started doing that. But it turned out their code has several leaky abstractions, which made it hard to override core behavior cleanly. Shortly after, OpenAI introduced breaking changes. Maintaining my customizations on top became increasingly difficult. So I rewrote the whole thing from scratch using Python. My version is designed to support local LLMs. Right now, it only works with phi-4-mini (GGUF) via…
Codex app for WindowsMar 2026 · learn.chatgpt.com · ▲145Codex now runs natively on Windows with secure sandbox
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