OpenAI Launches a New GPT-5 Model for Its Codex Coding Agent

Codex, OpenAI’s answer to the likes of GitHub Copilot, Claude Code and similar AI coding agents, is getting a major update today.

At the heart of this launch is GPT-5-Codex, a version of OpenAI’s latest GPT-5 models that the company optimizes specifically for agentic software engineering. And while a new model itself is newsworthy, the team also added a slew of additional features to Codex. These include a rebuilt Codex CLI, which is now centered around agentic workflows, a new IDE extension that brings Codex to tools like VS Code, Cursor…