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OpenAI's official Codex changelog. Codex app: Codex in ChatGPT, the desktop app and the web. Codex CLI: the version that runs in a terminal window.

Compiled by the Toolstash team · Updated

  1. Codex CLI

    Codex CLI 0.156.1

    1 new

    Choose GPT-6 Sol or GPT-6 Luna from the model picker. The rate-limit switch prompt now recommends GPT-6 Luna.

  2. Codex app

    Codex app

    Added a notification sound setting for task completions, permission requests, and questions. Choose Default, Classic, or None. On macOS, you can also choose a system sound or import an audio file. Performance improvements and bug fixes. Added a sign-in recovery dialog for session errors that prevent app startup. Preserved chat titles in the Rename dialog when worktree setup finishes.

  3. Codex CLI

    Codex CLI 0.156.0

    6 new6 fixes3 other

    Choose an optional fullscreen UI with /tui for your next launch, including transcript search, mouse selection, and right-click copying. Voice conversations are enabled by default, with an F8 toggle, a /voice settings picker, and bundled audio runtimes for Linux and Windows.

  4. New model

    GPT-6 Sol and Luna in Codex and ChatGPT Work

    GPT-6 Sol and GPT-6 Luna are rolling out to Codex and ChatGPT Work at lower token prices than their GPT-5.6 predecessors. Use Sol for complex coding and agentic workflows, and Luna for focused, high-volume tasks. Both models are rolling out to Plus, Pro, Business, Enterprise, and Edu users. Free and Go users can access Luna in the desktop app. Availability depends on rollout and workspace settings; Enterprise administrators must enable the new models. In ChatGPT, the models are available in Work and Codex, but not Chat. Choose a model in the picker when available. In the CLI, use /model or start a task with codex --model gpt-6-sol or codex --model gpt-6-luna.

  5. Codex app

    ChatGPT for iOS

    Create folders directly from the file picker. Added support for writing blocks, with draft alternatives and copy actions. New tasks remember your worktree mode and setup environment for each project. Long queued prompts show a compact preview and expand on tap. Fixed queued prompts missing or appearing outdated after reopening a task. Worktree task cards now open correctly after setup completes. Restored the new-task button for projects containing only worktree tasks. Improved voice-call reliability during temporary connection interruptions. Better alignment of project, environment, and Git controls on iPad. Fixed the thinking timer resetting when a new task starts.

  6. Codex CLI

    Codex CLI 0.155.1

    1 fix

    New local TUI sessions now leave reasoning summaries disabled by default, fixing request rejection by providers that do not support them. Explicit reasoning-summary settings remain respected.

  7. Codex app

    Codex app

    Performance improvements and bug fixes. Fixed WSL terminals opening in the wrong Linux distribution or project folder. Fixed adding WSL project folders, including folders on mapped drives. Updated sign-in screens to show only the methods allowed by your organization's policy.

  8. Codex CLI

    Codex CLI 0.155.0

    6 new6 fixes1 other

    Added experimental /voice conversations with live transcripts and microphone controls on supported builds, enabled through /experimental. The TUI now shows live reasoning summaries in the status row and completion timestamps after successful turns.

  9. Codex app

    Codex app

    Performance improvements and bug fixes. Fixed back navigation getting stuck between settings and a chat. Kept configuration warnings visible after app startup and window reloads. Improved focus and alignment in answer fields for questions from Codex.

  10. Codex app

    GPT-5.3-Codex-Spark deprecated

    GPT-5.3-Codex-Spark was deprecated on September 14, 2026. The research preview is no longer available in the ChatGPT desktop app, Codex CLI, or IDE extension. Switch to one of the recommended models, and update saved configurations, custom agents, and scripts that select gpt-5.3-codex-spark. For faster responses with a supported model, see Fast mode.

  11. Codex app

    GPT-5.5 retires from ChatGPT, ChatGPT Work, and Codex on October 14

    On October 14, 2026, GPT-5.5 will retire from ChatGPT, ChatGPT Work, and Codex on all plans, including consumer, Business, Enterprise, and Edu plans. This retirement does not apply to the OpenAI API. For Codex with ChatGPT sign-in, choose an available replacement for your plan and client. Update workspace defaults, saved model settings, managed configurations, custom agents, scheduled tasks, and scripts that still select gpt-5.5.

  12. Codex app

    Quick chats with Pets and Appshots on Windows

    Keep ChatGPT close while you work in other apps. In the ChatGPT desktop app on macOS and Windows, you can now type a quick chat from the floating Pets controls and press Enter to send it. Use @ to add context and $ to choose a skill. Select the bell icon to follow progress in your threads, then select a thread to open the full conversation. Choose a companion or show just the controls in Settings > Pets. Press Option+Space on macOS or Windows+Alt+P on Windows to show the controls and focus Quick Chat. Pressing the shortcut again keeps Quick Chat open. You can change Show pet in Settings > Keyboard shortcuts. To hide the controls, select Hide pet in the command menu or Settings > Pets. On macOS, you can also send an appshot to the floating controls. Keep the main ChatGPT window in the background and choose Automatic for Appshot destination. Learn more about Pets. Appshots are now available in the ChatGPT desktop app on Windows. Press both Alt keys to share the frontmost app window with ChatGPT, then ask a question or describe what you want to do. An appshot includes a screenshot and available text from that window. You can customize the shortcut and choose which chat receives it in settings. Other improvements and bug fixes. Open files directly from a conversation's Sources panel, or download files that ChatGPT can't preview. Assign a Codex Micro key to Insert text and add your own reusable text to the active prompt without sending it. Reset a pet to its default size in settings. Custom pets also stay in place when you refresh their artwork. Keep unfinished comments on response text when you switch chats and return. ChatGPT dictation now respects your saved Main language preference. Keep tab widths and scroll positions more stable as you close browser tabs in full and split views.

  13. Codex CLI

    Codex CLI Cygwin

  14. Codex CLI

    Codex CLI Python

  15. Codex CLI

    Codex CLI 0.154.0

    6 new6 fixes2 other

    GPT-6-Astra is now available in the model picker and Amazon Bedrock catalogs. Experimental worktree support lets you create isolated checkouts for new or forked sessions using --worktree or /worktree, then browse and resume them.

  16. Codex app

    Codex app

    Added a configurable shortcut to open web links in your default browser. Added Open with > New tab to file diffs so you can open a source file at the selected line in the app. Performance improvements and bug fixes. Improved recovery and responsiveness when reopening chats or sending messages while a chat resumes. Fixed duplicate follow-up messages appearing in restored chat history.

  17. Codex app

    ChatGPT for iOS

    Reference other tasks directly in the composer with @ mentions. Answer live questions while Codex continues working, without losing your draft. Explore files with Back navigation, recent files, and remembered reading positions. Choose a starting branch for new worktrees, or include your current local changes. Worktree setup can now continue in the background on iOS 26, with progress shown in a Live Activity. Voice now respects your selected model and reasoning effort. Restored missing delegated-task messages and fixed navigation between linked tasks. Code reviews now complete more reliably, without duplicate activity or stuck running states. Fixed crashes and stale queued messages when switching from Queue to Steer. Improved reconnect reliability and preserved device pairing during temporary service outages. Resolved duplicate plugin skills in composer suggestions.

  18. Codex app

    Codex MCP server removed

    The codex mcp-server command and standalone codex-mcp-server binary have been removed after their deprecation on August 24, 2026. Update integrations that launch either command before upgrading Codex. Use the Codex app server for integrations. The app-server command is experimental and isn't supported for production workloads. Codex continues to support connecting to external MCP servers through codex mcp.

  19. Codex CLI

    Codex CLI 0.153.3

    1 new1 fix

    Added GPT-6-Astra to the Amazon Bedrock model picker for Mantle and Runtime global/US routes.

  20. Codex CLI

    Codex CLI 0.153.4

    2 fixes

    Fixed Astra’s visibility in the bundled model picker and made it the bundled default when no model is explicitly configured. Updated Astra’s guidance to use asynchronous questions only when the tool is available in the session.

  21. Codex CLI

    Codex CLI 0.153.0

    5 new5 fixes3 other

    Vim mode now supports undo with u and redo with Ctrl+R, preserving complete drafts including pasted content and attachments. The plugin CLI can list, install, and remove plugins from remote marketplaces.

  22. Codex CLI

    Codex CLI 0.153.1

    1 new

    Added support for configuring GPT-6-Astra through the API without changing the default model or showing it in the model picker.

  23. Codex CLI

    Codex CLI 0.153.2

    1 fix

    Corrected the GPT-6-Astra Fast tier description to say “2x speed, increased usage” instead of “1.5x.” This changes only the displayed text, not how requests run.

  24. Codex app

    Codex app

    Includes updates through September 5, 2026. Performance improvements and bug fixes. Fixed the model picker closing while settings refresh. Distinguished successfully submitted feedback from failed diagnostic uploads. Fixed remote chats getting stuck when reopened after their host changes. Preserved preferences for automatically connecting to SSH hosts after an app restart.

  25. Codex app

    ChatGPT for iOS

    Attachments now work across all connected hosts, including Windows and Linux, and support videos from the Photo Library. Press and hold the attachment button to attach recent photos. A new Priority view brings running tasks, unread updates, and tasks awaiting your response to the top of the task list. Queued prompts now sync with the connected host, remain editable, and send even when the app is in the background. Long-running tasks now show their live working time. Task menus now include an option to copy the thread ID. Task list loading and organization are faster and more reliable, with simpler date sections and fewer stalls or disappearing projects. Reconnects are more reliable, resolving stuck Send states, missing approvals, and stale task updates. Long responses now stream with fewer visual interruptions. Side chat messages remain available until you close them, even after the chat can no longer reconnect.

  26. Codex CLI

    Codex CLI 0.152.0

    6 new8 fixes2 other

    Vim mode supports / and ? searches within drafts, highlighted matches, and repeat navigation with n and N. Rate-limit banners offer actions for checking usage, managing credits, resetting limits, and managing plans.

  27. Codex CLI

    Codex CLI 0.152.1

    1 fix

    Guardian approval review now honors Node REPL policies provided through model metadata.

  28. Codex app

    Codex app

    Performance improvements and bug fixes. Fixed new chats getting stuck after pasting a large amount of text. Improved startup recovery on Windows and cleared stale startup errors after reconnection. Fixed response streaming stalls in hidden app windows.

  29. Codex CLI

    Codex CLI 0.151.0

    3 new6 fixes2 other

    Added a configurable grace period for discovering tools from optional MCP servers. Extensions can now inspect or replace MCP tool results before they reach the model.

  30. Codex app

    Codex app

    Performance improvements and bug fixes. Preserved saved chats and projects when renaming an SSH connection.