The company says more than 1 million people used Codex over the past month. OpenAI first introduced the product in April, and made it broadly available in October. The new macOS app is now meant to push Codex further into everyday developer workflows—and to claw back share from rivals such as Anthropic and Cursor, which already offer popular, agent-based coding tools.
OpenAI CEO Sam Altman called Codex “the most beloved internal product we’ve ever had.”
“This is an amazing moment for us as a company. I stayed up at night out of excitement, building all kinds of things by myself,” Altman said.
Inside the app, agents run in separate threads organized by project. Developers can review proposed changes, approve edits, and keep working in parallel without losing context.
Codex also includes a Skills library—features that go beyond plain code generation, including tools like image generation and workflow integrations that can support broader tasks inside a project.
Among the new features are:
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Automations — scheduled workflows that let agents run in the background at set times.
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Assistant “personalities” — the ability to choose different behavioral styles for agents.
Codex access is typically bundled with paid ChatGPT plans—Plus, Pro, Business, Enterprise, or Edu. But alongside this release, OpenAI has opened the macOS app to everyone for a limited time.
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