Codex Release Notes

New model: GPT-5-Codex

GPT-5-Codex is a version of GPT-5 further optimized for agentic coding in Codex. It’s available in the IDE extension and CLI when you sign in with your ChatGPT account. It also powers the cloud agent and Code Review in GitHub. To learn more about GPT-5-Codex and how it performs compared to GPT-5 on software engineering tasks, see our announcement blog post.

Image outputs

When working in the cloud on front-end engineering tasks, GPT-5-Codex can now display screenshots of the UI in Codex web for you to review. With image output, you can iterate on the design without needing to check out the branch locally.

New in Codex CLI

• You can now resume sessions where you left off with codex resume.
• Context compaction automatically summarizes the session as it approaches the context window limit.

Learn more in the latest release notes

IDE extension (Compatible with VS Code, Cursor, Windsurf)

• Codex now runs in your IDE with an interactive UI for fast local iteration. Easily switch between modes and reasoning efforts.

Sign in with ChatGPT (IDE & CLI)

• One-click authentication that removes API keys and uses ChatGPT Enterprise credits.

Move work between local ↔ cloud

• Hand off tasks to Codex web from the IDE with the ability to apply changes locally so you can delegate jobs without leaving your editor.

Code Reviews

• Codex goes beyond static analysis. It checks a PR against its intent, reasons across the codebase and dependencies, and can run code to validate the behavior of changes.

Image inputs

• You can now attach images to your prompts in Codex web. This is great for asking Codex to implement frontend changes or follow up on whiteboarding sessions.

Container caching

• Codex now caches containers to start new tasks and followups 90% faster, dropping the median start time from 48 seconds to 5 seconds.
• You can optionally configure a maintenance script to update the environment from its cached state to prepare for new tasks. See the docs for more.

Automatic environment setup

• Now, environments without manual setup scripts automatically run the standard installation commands for common package managers like yarn, pnpm, npm, go mod, gradle, pip, poetry, uv, and cargo.
• This reduces test failures for new environments by 40%.

Codex can now generate multiple responses simultaneously for a single task, helping you quickly explore possible solutions to pick the best approach.

Fixes & improvements

• Added some keyboard shortcuts and a page to explore them. Open it by pressing ⌘-/ on macOS and Ctrl+/ on other platforms.
• Added a “branch” query parameter in addition to the existing “environment”, “prompt” and “tab=archived” parameters.
• Added a loading indicator when downloading a repo during container setup.
• Added support for cancelling tasks.
• Fixed issues causing tasks to fail during setup.
• Fixed issues running followups in environments where the setup script changes files that are gitignored.
• Improved how the agent understands and reacts to network access restrictions.
• Increased the update rate of text describing what Codex is doing.
• Increased the limit for setup script duration to 20 minutes for Pro, Team, and Business users.
• Polished code diffs: You can now option-click a code diff header to expand/collapse all of them.

Agent internet access

Now you can give Codex access to the internet during task execution to install dependencies, upgrade packages, run tests that need external resources, and more. Internet access is off by default. Plus, Pro, and Team users can enable it for specific environments, with granular control of which domains and HTTP methods Codex can access. Internet access for Enterprise users is coming soon. Learn more about usage and risks in the docs.

Update existing PRs

Now you can update existing pull requests when following up on a task.

Voice dictation

Now you can dictate tasks to Codex.

Fixes & improvements

• Added a link to this changelog from the profile menu.
• Added support for binary files: When applying patches, all file operations are supported. When using PRs, only deleting or renaming binary files is supported for now.
• Fixed an issue on iOS where follow up tasks where shown duplicated in the task list.
• Fixed an issue on iOS where pull request statuses were out of date.
• Fixed an issue with follow ups where the environments were incorrectly started with the state from the first turn, rather than the most recent state.
• Fixed internationalization of task events and logs.
• Improved error messages for setup scripts.
• Increased the limit on task diffs from 1 MB to 5 MB.
• Increased the limit for setup script duration from 5 to 10 minutes.
• Polished GitHub connection flow.
• Re-enabled Live Activities on iOS after resolving an issue with missed notifications.
• Removed the mandatory two-factor authentication requirement for users using SSO or social logins.

Fixes & improvements

• Added a button to retry failed tasks
• Added indicators to show that the agent runs without network access after setup
• Added options to copy git patches after pushing a PR
• Added support for unicode branch names
• Fixed a bug where secrets were not piped to the setup script
• Fixed creating branches when there’s a branch name conflict.
• Fixed rendering diffs with multi-character emojis.
• Improved error messages when starting tasks, running setup scripts, pushing PRs, or disconnected from GitHub to be more specific and indicate how to resolve the error.
• Improved onboarding for teams.
• Polished how new tasks look while loading.
• Polished the followup composer.
• Reduced GitHub disconnects by 90%.
• Reduced PR creation latency by 35%.
• Reduced tool call latency by 50%.
• Reduced task completion latency by 20%.
• Started setting page titles to task names so Codex tabs are easier to tell apart.
• Tweaked the system prompt so that agent knows it’s working without network, and can suggest that the user set up dependencies.
• Updated the docs.

It's now easier and faster to set up code execution.

Fixes & improvements

• Added a button to retry failed tasks
• Added indicators to show that the agent runs without network access after setup
• Added options to copy git patches after pushing a PR
• Added support for unicode branch names
• Fixed a bug where secrets were not piped to the setup script
• Fixed creating branches when there's a branch name conflict.
• Fixed rendering diffs with multi-character emojis.
• Improved error messages when starting tasks, running setup scripts, pushing PRs, or disconnected from GitHub to be more specific and indicate how to resolve the error.
• Improved onboarding for teams.
• Polished how new tasks look while loading.
• Polished the followup composer.
• Reduced GitHub disconnects by 90%.
• Reduced PR creation latency by 35%.
• Reduced tool call latency by 50%.
• Reduced task completion latency by 20%.
• Started setting page titles to task names so Codex tabs are easier to tell apart.
• Tweaked the system prompt so that agent knows it's working without network, and can suggest that the user set up dependencies.
• Updated the docs.