Codex Version History

This changelog tracks Codex releases across the CLI, desktop app, and IDE extension. For the full official changelog, see developers.openai.com/codex/changelog.

April 2026

Latest

GPT-5.5 Release - April 23, 2026

Introducing GPT-5.5 in Codex

GPT-5.5 — OpenAI’s latest frontier model — now rolls out across Codex (CLI, App, IDE)
Stronger agentic coding, computer use, knowledge work, and research workflows
1M context, pricing $5 / $30 per MTok input/output; GPT-5.5 Pro at $30 / $180
Available in Codex when signed in with ChatGPT (Plus / Pro / Business / Enterprise); API-key access rolling out next
Switch with /model gpt-5.5 in the CLI, or pick it in the app/IDE model selector
Fast service tier enabled by default for eligible ChatGPT plans

CLI v0.124.0 - April 23, 2026

Reasoning Controls, Multi-Environment, Hooks Stable

Install: npm install -g @openai/codex@0.124.0

TUI reasoning controls: Alt+, decreases reasoning level, Alt+. increases it
Multi-environment support in app-server sessions with per-turn environment selection
Amazon Bedrock integration with AWS SigV4 signing and credential-based authentication
Remote plugin marketplace listing and cross-repo plugin sources
Hooks now stable — configurable inline in config.toml and requirements.toml
Fast service tier now defaults for eligible ChatGPT plans
Fixed Cloudflare cookie preservation across ChatGPT hosts
Remote app-server reliability improvements
Permission mode drift corrections
Fixed MCP startup through app-server sessions

CLI v0.123.0 - April 23, 2026

Amazon Bedrock, /mcp verbose, Plugin MCP Loading

Install: npm install -g @openai/codex@0.123.0

Built-in Amazon Bedrock model provider with AWS profile support
/mcp verbose for comprehensive MCP server diagnostics and resources
Enhanced plugin MCP loading — accepts both mcpServers and top-level server maps
Improved realtime handoffs with transcript deltas
Host-specific remote_sandbox_config requirements
Fixed post-rollback /copy functionality
Fixed Unicode/dead-key input support in VS Code WSL terminals
Fixed proxy environment variable handling from shell snapshots
Fixed codex exec inheritance of root-level shared flags

CLI v0.122.0 - April 20, 2026

Standalone Installs, /side Conversations, Plan Mode Preview

Install: npm install -g @openai/codex@0.122.0

Standalone installs improved — codex app now opens Desktop correctly on Windows and Intel Macs
TUI /side conversations for quick questions with queued input, supporting slash commands
Plan Mode context-usage preview before implementing
Enhanced plugin workflows: tabbed browsing, inline toggles, marketplace removal
Filesystem deny-read glob policies with managed requirements and sandbox enforcement
Tool discovery and image generation enabled by default with higher-detail handling
New flags: --ignore-user-config and --ignore-rules for isolated codex exec runs
Split filesystem permission policies support
Fixed app-server approvals and MCP elicitations now disappear when resolved remotely
Remote-control startup tolerates missing ChatGPT auth
Resumed/forked threads replay token usage immediately

Codex App v26.415 - April 16, 2026

In-App Browser, Computer Use, Thread Automations, PR Reviews

In-app browser for local/public pages without sign-in, with direct comments on rendered pages
Computer use for macOS app operation (clicking, typing, visual interaction)
Chats as project-agnostic threads for research and analysis
Thread automations for scheduled wake-ups preserving conversation context
Task sidebar for tracking plans, sources, artifacts, and summaries
GitHub pull request reviews with diff inspection and comment review
Artifact viewer for PDFs, spreadsheets, documents, presentations
Memories carrying context from past tasks
Remote connections (SSH, alpha rollout)
Multi-terminal and multi-window support
Intel Mac and Windows system tray support

CLI v0.121.0 - April 15, 2026

Marketplace Add, Prompt History, Memory Controls

Install: npm install -g @openai/codex@0.121.0

codex marketplace add supporting GitHub, git URLs, local directories, and direct marketplace.json URLs
TUI prompt history with Ctrl+R reverse search and local recall for accepted slash commands
Memory mode controls: reset/deletion and cleanup in TUI and app-server
MCP Apps tool calls, namespaced MCP registration, parallel-call opt-in
Realtime output modality and transcript completion events
Secure devcontainer profile with bubblewrap support
Symlink-aware filesystem metadata
Fixed macOS sandbox/proxy handling for private DNS
Fixed Windows path matching with verbatim prefixes for resume --last
Guardian timeouts distinguished from policy denials with visible history entries
Broken symlinks skipped in fs/readDirectory

March 2026

CLI v0.117.0 - March 26, 2026

Plugins First-Class & Sub-Agent Addressing

Install: npm install -g @openai/codex@0.117.0

Plugins are now a first-class workflow with startup syncing, browsing, and installation capabilities
Sub-agent addressing: Sub-agents now use readable path-based addresses like /root/agent_a with structured messaging
Image workflows improved: view_image returns URLs for code mode, generated images are reopenable, history survives resume
Terminal title picker (/title) works in both TUI variants for session identification
App-server clients support shell commands, filesystem watches, and remote websocket connections
Prompt history recall now works in app-server TUI across sessions
App-server-backed TUI enabled by default
Bug fixes: duplicate live reasoning summaries eliminated, terminal state restoration on early exits, Linux sandbox reliability improvements

Plugin System Announcement - March 25, 2026

Build and Install Plugins in Codex

Plugin system now available across app, CLI, and IDE extensions
Plugin structure features .codex-plugin/plugin.json manifest with optional skills, app configs, and MCP server settings
Supports per-user or per-repo installation via marketplace files and local directories
Built-in @plugin-creator skill for scaffolding new plugins
Codex surfaces curated public plugins alongside community contributions

Codex App v26.323 - March 24, 2026

Thread Search & Archive

Search for past threads with sidebar shortcuts and keyboard navigation
One-click archive option for all local threads in projects
Settings sync between Codex app and VS Code extension

CLI v0.116.0 - March 19, 2026

Plugin Setup, Hooks & Realtime Sessions

Install: npm install -g @openai/codex@0.116.0

App-server TUI supports device-code ChatGPT sign-in and token refresh
Plugin setup improvements: prompts for missing plugins, honors suggestion allowlist, syncs state remotely
Added userpromptsubmit hook to block or augment prompts before execution
Realtime sessions start with recent thread context; reduced self-interruption during audio playback
Bug fixes: websocket prewarm stall with timeout fallback, conversation history for remote operations, Linux sandbox startup on symlinked checkouts

Codex App v26.318 - March 19, 2026

Skills in @ Menu

Skills now appear in the @ menu alongside other mentions for quick composer insertion
Cmd/Ctrl+F starts with current text selection for faster review searching

February 2026

GPT-5.3-Codex Announcement - February 5, 2026

Introducing GPT-5.3-Codex

The most capable agentic coding model to date for complex, real-world software engineering
Combines frontier coding performance of GPT-5.2-Codex with stronger reasoning and professional knowledge
Runs 25% faster for Codex users
Better collaboration while working — more frequent progress updates and real-time steering
Available across CLI, app, IDE extension, and Codex Cloud
Switch via codex --model gpt-5.3-codex or model selector in app/IDE

CLI v0.98.0 - February 5, 2026

GPT-5.3-Codex & Steer Mode Stable

Install: npm install -g @openai/codex@0.98.0

GPT-5.3-Codex support
Steer mode is now stable and enabled by default — Enter sends immediately during running tasks, Tab queues follow-up input
Fixed resumeThread() argument ordering in TypeScript SDK
Fixed model-instruction handling when changing models mid-conversation or resuming with a different model
Fixed remote compaction mismatch for token pre-estimation
Restored default assistant personality to Pragmatic

CLI v0.97.0 - February 5, 2026

Allow and Remember, Live Skills, Memory Plumbing

Install: npm install -g @openai/codex@0.97.0

Allow and remember — session-scoped option for MCP/App tool approvals, so repeated calls to the same tool auto-approve
Live skill updates — skill file changes picked up without restarting
/debug-config slash command to inspect effective configuration
Memory plumbing — initial API client and local persistence for thread memory summaries
Configurable log_dir for log redirection
Mixed text and image content in dynamic tool outputs for app-server integrations
Bug fixes: TUI jitter in apps/connectors picker, working status indicator restored, cloud requirements reliability

Codex App v260205 - February 5, 2026

GPT-5.3-Codex & Mid-Turn Steering

Support for GPT-5.3-Codex
Mid-turn steering — submit a message while Codex is working to direct its behavior
Attach or drop any file type
App flickering fix

CLI v0.96.0 - February 4, 2026

Thread Compact API & Unified Exec

Install: npm install -g @openai/codex@0.96.0

thread/compact async trigger in v2 app-server API for client-controlled compaction
WebSocket-side rate limit signaling via codex.rate_limits event
unified_exec enabled on all non-Windows platforms
Constrained requirement values include source provenance for /debug-config
Bug fixes: Esc handling in request_user_input, thread listing from state DB, dynamic tool injection transactions

Codex App v260204 - February 4, 2026

Zed & TextMate Support

Added Zed and TextMate as options to open files and folders
PDF preview in the review panel
Performance improvements

CLI v0.95.0 - February 4, 2026

Codex App Launcher, Personal Skills, Parallel Shell

Install: npm install -g @openai/codex@0.95.0

codex app <path> on macOS — launch Codex Desktop from CLI (auto-downloads DMG if missing)
Personal skills loaded from ~/.agents/skills (with ~/.codex/skills compatibility)
Remote skill listing and download via app-server APIs
Parallel shell tools — shell-related tools can run in parallel for improved throughput
/plan accepts inline prompt arguments and pasted images
Shell executions receive CODEX_THREAD_ID for active session detection
Vendored Bubblewrap (bwrap) sandbox groundwork for Linux
Bug fixes: Git command safety hardened, resume/thread listing reliability, sandbox mode consistency, codex exec hang after interrupt

Codex App Launch - February 2, 2026

Introducing the Codex Desktop App

macOS desktop interface for running agent threads in parallel
Project sidebar, thread list, and review pane
Built-in worktree support for isolated changes
Voice dictation and built-in Git tooling
Multitask across multiple projects simultaneously

Notable Feature Introductions Timeline

May 2025: Codex CLI initial release as open-source tool
June-August 2025: MCP integration, GitHub Actions, sandbox improvements
September 2025: Skills system, configuration overhaul
October 2025: IDE extension launch, app-server API
November 2025: Cloud environments (Codex Cloud), Slack integration
December 2025: Linear integration, worktree support
January 2026: Enhanced review mode, automation improvements
February 2026: GPT-5.3-Codex, Codex Desktop App, steer mode stable, personal skills, parallel shell tools, memory plumbing
March 2026: Plugin system first-class, sub-agent addressing, thread search, userpromptsubmit hook, realtime sessions
April 2026: GPT-5.5 rolling out, in-app browser, computer use (macOS), thread automations, GitHub PR reviews, Amazon Bedrock provider, TUI reasoning controls, hooks stable, marketplace add

Staying Updated

Official Changelog Full changelog at developers.openai.com/codex/changelog

GitHub Releases Follow CLI releases on GitHub

Install Latest CLI Run: npm install -g @openai/codex@latest