OpenAI Codex

OpenAI Codex is a cloud-based autonomous coding agent launched in May 2025. It connects to your GitHub repository via ChatGPT or a desktop app to automate code writing, testing, and PR creation. This guide covers core concepts, a 5-step quickstart, and a model comparison table.

OpenAI's Symphony, released in 2026 as an open-source spec, defines a "ticket-driven AI development" pattern: each Linear issue gets its own Codex agent in its own workspace and runs until the issue reaches a terminal state. This article walks through the spec's core ideas, the Elixir reference implementation, the polling / supervisor / workspace-isolation architecture, and the realistic operational considerations for adopting it — based on publicly available information.

In-depth comparison of OpenAI Codex, Claude Code, Cursor, and GitHub Copilot across pricing, features, SWE-bench scores, and use cases. Build your ideal AI coding stack with selection flowcharts and combination strategies.

A hands-on guide to @openai/codex-security, the open-source CLI and TypeScript SDK for OpenAI's security agent: the find-validate-patch pipeline, key commands, pre-commit hooks, CI integration with --fail-on-severity and SARIF export, cost controls, and requirements — based on the repository's primary sources.

Codex app update 26.715 (July 23, 2026): GPT-Live-powered ChatGPT Voice steers work across Chat, Work, and Codex, and local projects gain multi-folder support.

On April 16, 2026, OpenAI added Computer Use (Mac app control), 90+ plugins, image generation, Memory, and persistent tasks to Codex. This guide covers the full evolution from coding tool to desktop AI super-app.