OpenAI Codex: Plugins for Slack, Figma, Notion

After launching its macOS application and the GPT-5.3-Codex version in February, OpenAI continues to enhance its AI agent dedicated to development with a new plugin system. This initiative allows for the integration of skills, applications, and MCP server configurations into installable and shareable packages, a strategy already successfully adopted by Anthropic and Claude Code.

Plugins for Optimized Workflows

Codex already offered skills, instructions to automate specific tasks. The new plugins go further by combining these skills with application connectors and MCP servers into a versioned package. Unlike skills, which are designed for personal use, plugins are intended to be shared within a team or organization. Each plugin is defined by a manifest that identifies the package and its components, allowing for the standardization of workflows without individual reconfiguration of workstations.

More than 20 plugins are available in the Codex application, the CLI, and the VS Code extension. Notable integrations include Figma for linking design and code, Slack and Notion for team coordination, as well as Gmail and Google Drive for document management.

Developers can also design their own plugins and distribute them via private marketplaces, configured at the repository or personal environment level. An official directory of public plugins is planned, although no timeline has been announced by OpenAI.

A Response to Anthropic's Competition

This development comes as Anthropic has already launched a similar system for Claude Code, extended to its Cowork tool with plugins for marketing, finance, and operations. OpenAI is thus entering a market already explored by an established competitor.

The Codex plugins aim to attract professionals and businesses, integrating governance controls to define which plugins are allowed, blocked, or deployed by default. However, Claude Code already offers specialized sub-agents that Codex does not yet support, a gap that OpenAI may fill in a future update.

In terms of adoption, OpenAI claims more than one million weekly users for Codex and a usage increase of over 400% since the beginning of 2026. These figures indicate real traction, although Claude Code remains very popular within the developer community. This repositioning of Codex as a work platform is part of a broader strategy by OpenAI to transform its development agent into a hub for technical teams.