October 6, 2025 — OpenAI today announced that Codex is now generally available, transitioning out of its research preview stage and becoming a full, supported offering for developers and teams. 

With this launch, OpenAI rolled out three major features designed to boost adoption and usability:

• Slack integration — Developers can now @mention Codex within Slack channels or threads to ask questions or assign tasks, with context automatically pulled from the conversation. 

• Codex SDK — The same agent technology powering the Codex CLI is now embeddable in developer tools and workflows. The SDK currently supports TypeScript, and includes built-in context management and structured output for parsing responses. 

• Admin tools & analytics — ChatGPT workspace administrators gain visibility and control: they can delete or edit Codex cloud environments, enforce configuration overrides, and monitor usage through analytics dashboards tracking code review quality and task metrics. 

Why It Matters

Since its preview launch earlier this year, Codex has seen rapid growth: daily usage has increased more than 10× since August, and its underlying model — GPT-5-Codex — has quickly become one of OpenAI’s fastest growing models. 

OpenAI reports real gains internally as well: nearly all of its engineers now use Codex, and it automatically reviews about 70 % of pull requests, catching critical issues before they reach production. 

Examples in Action

• At Cisco, Codex has helped engineers cut the time needed for code reviews by up to 50 %. 

• At Instacart, the Codex SDK is integrated into internal tooling (called Olive) to automate refactoring, cleanup, and reduce tech debt. 

Access & Pricing

• The Slack integration and the SDK are available from today to users on ChatGPT Plus, Pro, Business, Edu, and Enterprise plans. 

• Admin features are available to Business, Edu, and Enterprise tiers. 

• Starting October 20, Codex cloud tasks will begin counting toward Codex usage limits.