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OpenAI/Codex Changelog

Codex Changelog

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Releases40Avg12/moVersionsv5.2-Codex → v0.121.0
Apr 16, 2026

Codex is becoming a broader workspace for getting work done with AI. This update makes it easier to start work with less setup, verify what Codex is building, create richer outputs, and keep momentum across longer-running tasks.

Verify more of your work

The Codex app now includes an early in-app browser. You can open local or public pages that don't require sign-in, comment directly on the rendered page, and ask Codex to address page-level feedback.

Computer use lets Codex operate macOS apps by seeing, clicking, and typing, which helps with native app testing, simulator flows, low-risk app settings, and GUI-only bugs.

The feature isn't available in the European Economic Area, the United Kingdom, or Switzerland at launch.

Start, follow, and steer work

Chats are threads you can start without choosing a project folder first. They're useful for research, writing, planning, analysis, source gathering, and tool-driven work that doesn't begin in a codebase.

For work that needs a later check-in, thread automations can wake up the same thread on a schedule while preserving the conversation context. Use them to check a long-running process, watch for updates, or continue a follow-up loop without starting from scratch.

The task sidebar makes plans, sources, generated artifacts, and summaries easier to follow while Codex works. Context-aware suggestions can also help you pick up relevant follow-ups when you start or return to Codex.

Stronger for software development

Codex now brings more of the pull request workflow into the app. You can inspect GitHub pull requests in the sidebar, review comments in the diff, review changed files, then ask Codex to explain feedback, make changes, check them, and keep the review moving.

Review richer outputs

The artifact viewer can preview generated files such as PDF files, spreadsheets, documents, and presentations in the sidebar before you commit or share them. Memories, where available, can also carry useful context from past tasks into future threads, including stable preferences, project conventions, and recurring work patterns.

Other features

Apr 15, 2026
Codex CLI Release: 0.121.0

New Features

  • Added codex marketplace add and app-server support for installing plugin marketplaces from GitHub, git URLs, local directories, and direct marketplace.json URLs (#17087, #17717, #17756).

  • Added TUI prompt history improvements, including Ctrl+R reverse search and local recall for accepted slash commands (#17550, #17336).

  • Added TUI and app-server controls for memory mode, memory reset/deletion, and memory-extension cleanup (#17632, #17626, #17913, #17937, #17844).

  • Expanded MCP/plugin support with MCP Apps tool calls, namespaced MCP registration, parallel-call opt-in, and sandbox-state metadata for MCP servers (#17364, #17404, #17667, #17763).

  • Added realtime and app-server APIs for output modality, transcript completion events, raw turn item injection, and symlink-aware filesystem metadata (#17701, #17703, #17719).

  • Added a secure devcontainer profile with bubblewrap support, plus macOS sandbox allowlists for Unix sockets (#10431, #17547, #17654).

Bug Fixes

  • Fixed macOS sandbox/proxy handling for private DNS and removed the danger-full-access denylist-only network mode (#17370, #17732).

  • Fixed Windows cwd/session matching so resume --last and thread/list work when paths use verbatim prefixes (#17414).

  • Fixed rate-limit/account handling for prolite plans and made unknown WHAM plan values decodable (#17419).

  • Made Guardian timeouts distinct from policy denials, with timeout-specific guidance and visible TUI history entries (#17381, #17486, #17521, #17557).

  • Stabilized app-server behavior by avoiding premature thread unloads, tolerating failed trust persistence on startup, and skipping broken symlinks in fs/readDirectory (#17398, #17595, #17907).

  • Fixed MCP/tool-call edge cases including flattened deferred tool names, elicitation timeout accounting, and empty namespace descriptions (#17556, #17566, #17946).

Documentation

  • Documented the secure devcontainer profile and its bubblewrap requirements (#10431, #17547).

  • Added TUI composer documentation for history search behavior (#17550).

  • Updated app-server docs for new MCP, marketplace, turn injection, memory reset, filesystem metadata, external-agent migration, and websocket token-hash APIs (#17364, #17717, #17703, #17913, #17719, #17855, #17871).

  • Documented WSL1 bubblewrap limitations and WSL2 behavior (#17559).

  • Added memory pipeline documentation for extension cleanup (#17844).

Chores

  • Hardened supply-chain and CI inputs by pinning GitHub Actions, cargo installs, git dependencies, V8 checksums, and cargo-deny source allowlists (#17471).

  • Added Bazel release-build verification so release-only Rust code is compiled in PR CI (#17704, #17705).

  • Introduced the codex-thread-store crate/interface and moved local thread listing behind it (#17659, #17824).

  • Required reviewed pnpm dependency build scripts for workspace installs (#17558).

  • Reduced Rust maintenance surface with broader absolute-path types and removal of unused helper APIs (#17407, #17792, #17146).

Changelog

Full Changelog: rust-v0.120.0...rust-v0.121.0

Apr 11, 2026
Codex CLI Release: 0.120.0

New Features

  • Realtime V2 can now stream background agent progress while work is still running and queue follow-up responses until the active response completes (#17264, #17306)

  • Hook activity in the TUI is easier to scan, with live running hooks shown separately and completed hook output kept only when useful (#17266)

  • Custom TUI status lines can include the renamed thread title (#17187)

  • Code-mode tool declarations now include MCP outputSchema details so structured tool results are typed more precisely (#17210)

  • SessionStart hooks can distinguish sessions created by /clear from fresh startup or resume sessions (#17073)

Bug Fixes

  • Fixed Windows elevated sandbox handling for split filesystem policies, including read-only carveouts under writable roots (#14568)

  • Fixed sandbox permission handling for symlinked writable roots and carveouts, preventing failures in shell and apply_patch workflows (#15981)

  • Fixed codex --remote wss://... panics by installing the Rustls crypto provider before TLS websocket connections (#17288)

  • Preserved tool search result ordering instead of alphabetically reordering results (#17263)

  • Fixed live Stop-hook prompts so they appear immediately instead of only after thread history reloads (#17189)

  • Fixed app-server MCP cleanup on disconnect so unsubscribed threads and resources are torn down correctly (#17223)

Documentation

  • Documented the elevated vs restricted-token Windows sandbox support split in the core README (#14568)

  • Updated app-server protocol documentation for the new /clear SessionStart source (#17073)

Chores

  • Made rollout recording more reliable by retrying failed flushes and surfacing durability failures instead of dropping buffered items (#17214)

  • Added analytics schemas and metadata wiring for compaction and Guardian review events (#17155, #17055)

  • Improved Guardian follow-up efficiency by sending transcript deltas instead of repeatedly resending full history (#17269)

  • Added stable Guardian review IDs across app-server events and internal approval state (#17298)

Changelog

Full Changelog: rust-v0.119.0...rust-v0.120.0

Apr 10, 2026
Codex CLI Release: 0.119.0

New Features

  • Realtime voice sessions now default to the v2 WebRTC path, with configurable transport, voice selection, native TUI media support, and app-server coverage for the new flow (#16960, #17057, #17058, #17093, #17097, #17145, #17165, #17176, #17183, #17188).

  • MCP Apps and custom MCP servers gained richer support, including resource reads, tool-call metadata, custom-server tool search, server-driven elicitations, file-parameter uploads, and more reliable plugin cache refreshes (#16082, #16465, #16944, #17043, #15197, #16191, #16947).

  • Remote/app-server workflows now support egress websocket transport, remote --cd forwarding, runtime remote-control enablement, sandbox-aware filesystem APIs, and an experimental codex exec-server subcommand (#15951, #16700, #16973, #16751, #17059, #17142, #17162).

  • The TUI can copy the latest agent response with Ctrl+O, including better clipboard behavior over SSH and across platforms (#16966).

  • /resume can now jump directly to a session by ID or name from the TUI (#17222).

  • TUI notifications are more configurable, including Warp OSC 9 support and an opt-in mode for notifications even while the terminal is focused (#17174, #17175).

Bug Fixes

  • The TUI starts faster by fetching rate limits asynchronously, and /status now refreshes stale limits instead of showing frozen or misleading quota information (#16201, #17039).

  • Resume flows are more stable: the picker no longer flashes false empty states, uses fresher thread names, stabilizes timestamp labels, preserves resume hints on zero-token exits, and avoids crashing when resuming the current thread (#16591, #16601, #16822, #16987, #17086).

  • Composer and chat behavior are smoother, including fixed paste teardown, CJK word navigation, stale /copy output, percent-decoded local file links, and clearer truncated exec-output hints (#16202, #16829, #16648, #16810, #17076).

  • Fast Mode no longer stays stuck on after /fast off in app-server-backed TUI sessions (#16833).

  • MCP status and startup are less noisy and faster: hyphenated server names list tools correctly, /mcp avoids slow full inventory probes, disabled servers skip auth probing, and residency headers are honored by codex mcp-server (#16674, #16831, #17098, #16952).

  • Sandbox, network, and platform edge cases were tightened, including clearer read-only apply_patch errors, refreshed network proxy policy after sandbox changes, suppressed irrelevant bubblewrap warnings, a macOS HTTP-client sandbox panic fix, and Windows firewall address handling (#16885, #17040, #16667, #16670, #17053).

Documentation

  • The README now uses the current ChatGPT Business plan name (#16348).

  • Developer guidance for argument_comment_lint was updated to favor getting CI started instead of blocking on slow local lint runs (#16375).

  • Obsolete codex-cli README content was removed to avoid stale setup guidance (#17096).

  • codex exec --help now shows clearer usage and approval-mode wording (#16881, #16888).

Chores

  • codex-core was slimmed down through major crate extractions for MCP, tools, config, model management, auth, feedback, protocol, and related ownership boundaries (#15919, #16379, #16508, #16523, #16962).

  • Rust CI and workspace guardrails were simplified by blocking new crate features and dropping routine --all-features runs (#16455, #16473).

  • Core compile times were reduced by removing expensive async-trait expansion from hot tool/task abstractions (#16630, #16631).

  • Bazel diagnostics and dependency wiring improved with compact execution logs, repository-cache persistence, remote downloader support, and several platform-specific build fixes (#16577, #16926, #16928, #16634, #16744).

Changelog

Full Changelog: rust-v0.118.0...rust-v0.119.0

Apr 7, 2026

We're updating model availability for users who sign in with ChatGPT. Starting April 7, the model picker no longer shows gpt-5.2-codex, gpt-5.1-codex-mini, gpt-5.1-codex-max, gpt-5.1-codex, gpt-5.1, or gpt-5. On April 14, we'll remove those models from Codex for ChatGPT sign-in.

Users can still choose from gpt-5.4, gpt-5.4-mini, gpt-5.3-codex, and gpt-5.2. ChatGPT Pro users can also choose gpt-5.3-codex-spark.

To use another API-supported model in Codex, sign in with an API key or configure a model provider.

Mar 31, 2026
Codex CLI Release: 0.118.0

New Features

  • Windows sandbox runs can now enforce proxy-only networking with OS-level egress rules, instead of relying on environment variables alone. (#12220)

  • App-server clients can now start ChatGPT sign-in with a device code flow, which helps when browser callback login is unreliable or unavailable. (#15525)

  • codex exec now supports the prompt-plus-stdin workflow, so you can pipe input and still pass a separate prompt on the command line. (#15917)

  • Custom model providers can now fetch and refresh short-lived bearer tokens dynamically, instead of being limited to static credentials from config or environment variables. (#16286, #16287, #16288)

Bug Fixes

  • Project-local .codex files are now protected even on first creation, closing a gap where the initial write could bypass normal approval checks. (#15067)

  • Linux sandbox launches are more reliable because Codex once again finds a trusted system bwrap on normal multi-entry PATHs. (#15791, #15973)

  • The app-server-backed TUI regained several missing workflows: hook notifications replay correctly, /copy and /resume work again, /agent no longer shows stale threads, and the skills picker scrolls past the first page. (#16013, #16021, #16050, #16014, #16109, #16110)

  • MCP startup is more robust: local servers get a longer startup window, and failed handshakes surface warnings in the TUI again instead of looking like clean startups. (#16080, #16041)

  • On Windows, apply_patch is less likely to fail because it no longer adds redundant writable roots that could trigger unnecessary ACL churn. (#16030)

Changelog

Full Changelog: rust-v0.117.0...rust-v0.118.0

Mar 26, 2026
Codex CLI Release: 0.117.0

New Features

  • Plugins are now a first-class workflow: Codex can sync product-scoped plugins at startup, browse them in /plugins, and install or remove them with clearer auth/setup handling. (#15041, #15042, #15195, #15215, #15217, #15264, #15275, #15342, #15580, #15606, #15802)

  • Sub-agents now use readable path-based addresses like /root/agent_a, with structured inter-agent messaging and agent listing for multi-agent v2 workflows. (#15313, #15515, #15556, #15570, #15621, #15647)

  • The /title terminal-title picker now works in both the classic TUI and the app-server TUI, making parallel sessions easier to tell apart. (#12334, #15860)

  • App-server clients can now send ! shell commands, watch filesystem changes, and connect to remote websocket servers with bearer-token auth. (#14988, #14533, #14847, #14853)

  • Image workflows got smoother: view_image now returns image URLs for code mode, generated images are reopenable from the TUI, and image-generation history survives resume. (#15072, #15154, #15223)

  • Prompt history recall now works in the app-server TUI, including across sessions. (#14945)

Bug Fixes

  • tui_app_server no longer duplicates live reasoning summaries or /review output, and it preserves transcript text instead of dropping it under backpressure. (#15758, #15839, #15759)

  • ChatGPT login in tui_app_server now opens the local browser again, cancels cleanly on Ctrl+C, and no longer fails startup when you're logged out. (#15672, #15673, #15670)

  • Early exits now restore terminal state reliably, avoiding broken shell state after quitting; tmux users also get a working queued-message edit shortcut on Shift+Left. (#15671, #15480)

  • Linux sandboxed tool calls are more reliable on older distributions with older bubblewrap, and Windows restricted-token sandboxing now supports more split-policy carveout layouts. (#15693, #14172)

  • Remote multi-agent sessions now show agent names instead of raw IDs and recover more gracefully from stale turn-steering races. (#15513, #15714, #15163)

  • Plugin-backed mentions and product gating now behave more predictably, fixing cases where explicit mentions lost context or plugins were filtered incorrectly. (#15372, #15263, #15279)

Documentation

  • Expanded the app-server and exec-server docs/schema fixtures to cover exec-server setup, filesystem watch RPCs, realtime transcript notifications, and the new Python thread.run(...) quickstart flow. (#15089, #14533, #15344, #15088)

Chores

  • The app-server-backed TUI is now enabled by default, and the plugin/app rollout flags have been flipped on in normal builds. (#15661, #15713, #15719, #15820)

  • Removed the legacy artifact tool and retired the old read_file and grep_files handlers as part of ongoing tool-surface cleanup. (#15851, #15864, #15773, #15775)

Changelog

Full Changelog: rust-v0.116.0...rust-v0.117.0

Mar 25, 2026

Codex now supports plugins: installable bundles that package skills, app integrations, and MCP server configuration for reusable workflows.

Plugins are available in the Codex app, CLI, and IDE extensions.

You can install curated plugins from the plugin directory, or scaffold a local plugin with @plugin-creator and test it with workspace-scoped or home-scoped marketplaces.

Learn more in the plugins documentation.

Plugin structure

Every plugin is a folder with a required .codex-plugin/plugin.json manifest and optional supporting files:

my-plugin/
  .codex-plugin/
    plugin.json   # Required: plugin manifest
  skills/         # Optional: packaged skills
  .app.json       # Optional: app or connector mappings
  .mcp.json       # Optional: MCP server configuration
  assets/         # Optional: icons, logos, screenshots

Install plugins per-user or per-repo

You can install plugins for just yourself with ~/.agents/plugins/marketplace.json and ~/.codex/plugins/, or for everyone on a project with .agents/plugins/marketplace.json and a repo-local plugin directory such as ./plugins/.

Curated plugins and local development

Codex surfaces curated public plugins in the plugin directory. Codex also ships with the built-in @plugin-creator skill to help you scaffold a plugin, add a local marketplace entry, and test it before sharing it with teammates.

Mar 24, 2026

New features

  • Added search for past Codex app threads, including a sidebar shortcut and keyboard shortcuts for jumping to recent threads.
  • Added a one-click option to archive all local threads in a project.
  • Synced key settings between the Codex app and the VS Code extension, and added a settings entry point in the extension.

Performance improvements and bug fixes

  • Additional performance improvements and bug fixes.
Mar 19, 2026

New features

  • Added skills to the @ menu so you can insert them from the composer alongside other mentions.
  • Cmd/Ctrl+F now starts with your current text selection, which makes searching reviews and diffs faster.

Performance improvements and bug fixes

  • Additional performance improvements and bug fixes.
Codex CLI Release: 0.116.0

New Features

  • App-server TUI now supports device-code ChatGPT sign-in during onboarding and can refresh existing ChatGPT tokens. (#14952)

  • Plugin setup is smoother: Codex can prompt to install missing plugins or connectors, honor a configured suggestion allowlist, and sync install/uninstall state remotely. (#14896, #15022, #14878)

  • Added a userpromptsubmit hook so prompts can be blocked or augmented before execution and before they enter history. (#14626)

  • Realtime sessions now start with recent thread context and are less likely to self-interrupt during audio playback. (#14829, #14827)

Bug Fixes

  • Fixed a first-turn stall where websocket prewarm could delay turn/start; startup now times out and falls back cleanly. (#14838)

  • Restored conversation history for remote resume/fork in the app-server TUI and stopped duplicate live transcript output from legacy stream events. (#14930, #14892)

  • Improved Linux sandbox startup on symlinked checkouts, missing writable roots, and Ubuntu/AppArmor hosts by preferring system bwrap when available. (#14849, #14890, #14963)

  • Fixed an agent job finalization race and reduced status polling churn for worker threads. (#14843)

Documentation

  • Refreshed the Python SDK public API docs, examples, and walkthrough around the generated app-server models. (#14446)

Chores

  • Pinned the setup-zig GitHub Action to an immutable SHA for more reproducible CI. (#14858)

Changelog

Full Changelog: rust-v0.115.0...rust-v0.116.0

Mar 18, 2026

New features

  • You can now fork a conversation from an earlier message, not just the latest turn.
  • Added slash commands for switching models and reasoning levels, and made slash commands work in the middle of a draft prompt.
  • Added notifications for plan mode questions so it's easier to notice when Codex needs input.

Performance improvements and bug fixes

  • Fixed thread handoff and subagent navigation issues across worktrees and the VS Code extension.
  • Additional performance improvements and bug fixes.
Mar 17, 2026
Introducing GPT-5.4 mini in Codex

GPT-5.4 mini is now available in Codex as a fast, efficient model for lighter coding tasks and subagents.

It improves over GPT-5 mini across coding, reasoning, image understanding, and tool use while running more than 2x faster. In Codex, GPT-5.4 mini uses 30% as much of your included limits as GPT-5.4, so comparable tasks can last about 3.3x longer before you hit those limits.

GPT-5.4 mini is available in the Codex app, the CLI, the IDE extension, and Codex on the web. GPT-5.4 mini is also available in the API.

Use GPT-5.4 mini for codebase exploration, large-file review, processing supporting documents, and other less reasoning-intensive subagent work. For more complex planning, coordination, and final judgment, start with GPT-5.4.

To switch to GPT-5.4 mini:

  • In the CLI, start a new thread with: 
    codex --model gpt-5.4-mini
    Or use /model during a session.
  • In the IDE extension, choose GPT-5.4 mini from the model selector in the composer.
  • In the Codex app, choose GPT-5.4 mini from the model selector in the composer.

If you don't see GPT-5.4 mini yet, update the CLI, IDE extension, or Codex app to the latest version.

Mar 16, 2026

New features

  • Added back and forward buttons in the header so you can move between recent screens more quickly.
  • Added an Open in Finder, Open in Explorer, or Open in File Manager action from thread menus to jump straight to a thread's project folder.

Performance improvements and bug fixes

  • Improved resume and thread error toasts with clearer details when something goes wrong.
  • Additional performance improvements and bug fixes.
Codex CLI Release: 0.115.0

New Features

  • Supported models can now request full-resolution image inspection through both view_image and codex.emitImage(..., detail: "original"), which helps with precision visual tasks. (#14175)

  • js_repl now exposes codex.cwd and codex.homeDir, and saved codex.tool(...) / codex.emitImage(...) references keep working across cells. (#14385, #14503)

  • Realtime websocket sessions gained a dedicated transcription mode, plus v2 handoff support through the codex tool, with a unified [realtime] session config. (#14554, #14556, #14606)

  • The v2 app-server now exposes filesystem RPCs for file reads, writes, copies, directory operations, and path watching, and there is a new Python SDK for integrating with that API. (#14245, #14435)

  • Smart Approvals can now route review requests through a guardian subagent in core, app-server, and TUI, reducing repeated setup work on follow-up approvals. (#13860, #14668)

  • App integrations now use the Responses API tool-search flow, can suggest missing tools, and fall back cleanly when the active model does not support search-based lookup. (#14274, #14287, #14732)

Bug Fixes

  • Spawned subagents now inherit sandbox and network rules more reliably, including project-profile layering, persisted host approvals, and symlinked writable roots. (#14619, #14650, #14674, #14807)

  • js_repl no longer hangs when dynamic tool responses contain literal U+2028 or U+2029 characters. (#14421)

  • The TUI no longer stalls on exit after creating subagents, and interrupting a turn no longer tears down background terminals by default. (#14816, #14602)

  • codex exec --profile once again preserves profile-scoped settings when starting or resuming a thread. (#14524)

  • MCP and elicitation flows are more robust, with safer tool-name normalization and preserved tool_params in approval prompts. (#14491, #14605, #14769)

  • The local network proxy now serves CONNECT traffic as explicit HTTP/1, improving compatibility with HTTP proxy clients. (#14395)

Chores

  • The subagent wait tool is now consistently named wait_agent, aligning it with spawn_agent and send_input. (#14631)

Changelog

Full Changelog: rust-v0.114.0...rust-v0.115.0

Mar 12, 2026

Themes

Change the Codex app appearance in Settings by choosing a base theme, adjusting accent, background, and foreground colors, and changing the UI and code fonts. You can also share your custom theme with friends.

Revamped Automations

You can now choose whether automations run locally or on a worktree, define custom reasoning levels and models, and use templates to find inspiration for new automations.

Performance improvements and bug fixes

Various bug fixes and performance improvements.

Mar 11, 2026

New features

  • Codex can now read the integrated terminal for the current thread, so it can check the status of a running development server or refer back to failed build output while it works with you.

Performance improvements and bug fixes

  • Additional performance improvements and bug fixes.
Mar 5, 2026
Introducing GPT-5.4 in Codex

GPT-5.4 is now available in Codex as OpenAI's most capable and efficient frontier model for professional work.

It combines recent advances in reasoning, coding, and agentic workflows in one model, and it's the recommended choice for most Codex tasks.

In Codex, GPT-5.4 is the first general-purpose model with native computer-use capabilities. GPT-5.4 in Codex includes experimental support for the 1M context window. It supports complex workflows across applications and long-horizon tasks, with stronger tool use and tool search that help agents find and use the right tools more efficiently.

GPT-5.4 is available everywhere you can use Codex: the Codex app, the CLI, the IDE extension, and Codex Cloud on the web. GPT-5.4 is also available in the API.

To switch to GPT-5.4:

  • In the CLI, start a new thread with: 
    codex --model gpt-5.4
    Or use /model during a session.
  • In the IDE extension, choose GPT-5.4 from the model selector in the composer.
  • In the Codex app, choose GPT-5.4 from the model selector in the composer.

If you don't see GPT-5.4 yet, update the CLI, IDE extension, or Codex app to the latest version.

Performance improvements and bug fixes

  • Improved remote connections with clearer connection errors, better status updates, and clearer host labels in thread and settings views.
  • Fixed copy and paste shortcuts in the integrated terminal on Windows.
  • Fixed an issue where archived pinned threads could reappear in the sidebar.
  • Fixed an issue where repeated codex://new links could stop prefilling a new conversation when the app was already open.
  • Additional performance improvements and bug fixes.
Mar 4, 2026

Codex app for Windows

The Codex app is now available on Windows. The app gives you one interface for working across projects, running parallel agent threads, and reviewing results in one place.

The Codex app runs natively on Windows using PowerShell and a native Windows sandbox for bounded permissions, so you can use Codex on Windows without moving your workflow into WSL, onto a virtual machine, or by deactivating the sandbox.

The Windows app includes the same core features as the rest of the Codex app:

  • Skills to discover and extend Codex capabilities.
  • Automations to run work in the background.
  • Worktrees to handle independent tasks in the same project.

If you prefer to develop in WSL, you can also switch the Codex agent and the integrated terminal to run there.

Download it from the Microsoft Store and sign in with your ChatGPT account or an API key. For setup and configuration details, see Setup, Use WSL with the Codex app, and Customize the app for your development setup.

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Apr 16, 2026
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developers.openai.com/codex/changelog
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