Codex is now generally available

We’re announcing the general availability of Codex and three new features that make it even more useful for engineering teams:

• A new Slack integration: Delegate tasks or ask questions to Codex directly from a team channel or thread, just like you would a coworker.

• Codex SDK: Embed the same agent that powers the Codex CLI into your own workflows, tools, and apps for state-of-the-art performance on GPT‑5‑Codex⁠ without extra tuning.

• New admin tools: With environment controls, monitoring, and analytics dashboards, ChatGPT workspace admins now have more visibility and control to manage Codex at scale.

Since the Codex cloud agent⁠ launched in research preview in May, Codex has steadily evolved into a more reliable and capable coding collaborator. You can now work with it everywhere you code—in your editor, terminal, and the cloud, all connected by your ChatGPT account. Daily usage of Codex has grown by more than 10x since early August, and GPT‑5‑Codex is one of our fastest growing models ever, serving over 40 trillion tokens in the three weeks since launch.

Codex is now used by developers all over the world, from startups like Duolingo and Vanta to large enterprises like Cisco and Rakuten. Inside OpenAI, it’s become integral to how we build: nearly all engineers use Codex today, up from just over half in July. They merge 70% more pull requests each week, and Codex automatically reviews almost every PR to catch critical issues before they reach production.

The general availability of Codex reflects how quickly developers and teams everywhere are adopting it—and how much it’s already changing the way we build. 

Codex in Slack

Codex SDK

GPT‑5‑Codex was trained for Codex—specifically, the open-source agent implementation that powers the Codex CLI. We also tuned the agent implementation so that its prompt, tool definitions, and agent loop  deliver faster and more accurate results with models like GPT‑5‑Codex.