OpenAI releases Chronicle in Codex: What is it and how to use

OpenAI has introduced a new feature called Chronicle for Codex. The feature is currently available as an opt-in research preview and is designed to reduce the need for repeatedly explaining context to Codex while working on projects.

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Chronicle works alongside Codex’s memory system. By looking at recent screen activity, it can understand what you are referring to when you mention things like ‘this error,’ ‘that document,’ or a task you were working on earlier. Over time, the system can learn about the tools you use, the projects you revisit, and the workflows you typically follow.

Last week, we released a preview of memories in Codex.

Today, we’re expanding the experiment with Chronicle, which improves memories using recent screen context.

Now, Codex can help with what you’ve been working on without you restating context. pic.twitter.com/b3p8I5eXOy

— OpenAI Developers (@OpenAIDevs) April 20, 2026

OpenAI’s Codex Chronicle feature: How it works

Chronicle helps Codex build better context around your work. It does this by using recent screen captures to generate memories about what you were doing. These memories allow Codex to respond more accurately when you ask questions or request help related to something already on your screen.

The feature also helps Codex to learn which tools you frequently use, the projects you return to, and the kind of workflows you rely on. 

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‘Screen captures are stored temporarily on device to generate memories—also stored on device. You can inspect and edit memories. Be aware that other apps may access these files,’ OpenAI explained in a post on X.

For now, Chronicle is available to Pro users on macOS. The rollout currently excludes users in the EU, UK and Switzerland.

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How to use OpenAI’s Codex Chronicle feature

• Step 1: Open Settings in the Codex app.
• Step 2: Go to Personalisation and enable Memories.
• Step 3: Turn on Chronicle below the Memories setting.
• Step 4: Review the prompted dialog and tap Continue.
• Step 5: Give permissions to macOS Screen Recording and Accessibility when prompted.
• Step 6: Once the setup is complete, select the Try it out option or start a new thread.

If macOS shows that Screen Recording or Accessibility permission is denied, just head to System Settings > Privacy & Security > Screen Recording or Accessibility and enable Codex. 

Ayushi Jain

Ayushi works as Chief Copy Editor at Digit, covering everything from breaking tech news to in-depth smartphone reviews. Prior to Digit, she was part of the editorial team at IANS. View Full Profile