OpenAI’s Codex coding agent hits general availability with new tools

OpenAI has officially moved its Codex coding assistant from research preview to general availability, making the AI agent a standard collaborator for engineering teams. The full release introduces a new Slack integration, a dedicated Software Development Kit (SDK), and enhanced administrative tools, all powered by the specialised GPT-5-Codex model.

Since its research preview launched in May, daily usage of Codex has seen a significant increase, growing over ten times since early August. The underlying model, GPT-5-Codex, shows high adoption, serving over 40 trillion tokens in the three weeks following its launch. Inside OpenAI, the tool has become central to development, with almost all engineers now using Codex. The company states its engineers merge 70% more pull requests each week, and the agent automatically reviews nearly every pull request to identify critical issues.

The general availability emphasises the agent’s ability to work across various environments, the editor, terminal, and cloud, all connected through a user’s ChatGPT account.

New Features Focus on Team Workflow

The general availability is marked by three new features designed to embed Codex directly into enterprise workflows:

• Slack Integration: Teams can now assign tasks or ask questions to the agent by tagging @Codex in a Slack channel or thread. The agent automatically gathers context, selects the correct environment, completes the task in the Codex cloud, and posts a link to the results for review or merging.

• Codex SDK: The new SDK allows developers to embed the core agent into custom workflows, tools, and applications. The SDK leverages the specialised GPT-5-Codex tuning to deliver fast, accurate performance without additional model adjustment. Currently available for TypeScript, the SDK offers structured outputs for response parsing and built-in context management to resume sessions. OpenAI also provides a new GitHub Action to simplify Codex integration into CI/CD pipelines.

• New Admin Tools: ChatGPT workspace administrators gain greater control and visibility over large-scale Codex use. These tools include dashboards for monitoring usage and analytics across the CLI, IDE, and web. Admins can also manage cloud environments, such as editing or deleting unused environments, and enforce configuration overrides for local usage of the Codex CLI and IDE extension.

Availability and Pricing Structure

The Slack integration and the Codex SDK are available to developers with ChatGPT Plus, Pro, Business, Edu, and Enterprise subscriptions. The new admin features cater to Business, Edu, and Enterprise plans.

OpenAI confirmed that, starting October 20, tasks executed in the Codex cloud environment will begin counting toward a user's plan-specific usage limits. The company directs users to its documentation for detailed pricing and usage information across the different subscription tiers